All such bonds shall be sold for not less than the principal amount thereof plus accrued interest. All bonds issued by the Government of the Virgin Islands, specifically including interest thereon, shall be exempt from taxation by the Government of the Virgin Islands or any political subdivision thereof; by any State, territory or possession or any political subdivision thereof, or by the District of Columbia. (d) The proceeds of the bond issue or other obligation herein authorized shall be expended only for public purposes as set forth in this section or for the reduction of the debt created by such bond issue or obligation. (e) For purposes of this section bonds shall mean bonds, notes, or other obligations and shall be deemed to include bonds to refund any bonds, notes, or other obligations. (f) Aggregate bonds issued in support of a single project pursuant to section (b) above, which exceed 20 percent of the average Government revenue for the previous three years, shall be approved by a majority of the qualified voters of the Virgin Islands voting on the question at a referendum. (g) Bonds may not be issued for the operating expenses of the Government of the Virgin Islands, except that short-term bonds which are required to be repaid within one year may be issued by law to meet appropriations for any fiscal period in anticipation of the collection of revenue for that period or to meet casual deficits. AUDITOR GENERAL Section 4. (a) There shall be an Auditor General, who shall be appointed by the Governor with the advice and consent of the Senate and shall serve for a term of six years. (b) The Auditor General shall be a United States citizen, a Virgin Islands citizen, a qualified voter of the Virgin Islands, a domiciliary of the Virgin Islands for at least five years, and shall have such other qualifications as may be provided by law. (c) The Auditor General shall audit all revenues, accounts, expenditures, and programs of the Government, its departments, offices, agencies, and instrumentalities; shall make a public report and any special reports that may be required by the Governor or the Senate, and shall perform other duties as may be provided by law. In the performance of official duties, the Auditor General shall have the authority to administer oaths, take evidence, compel the attendance of witnesses and the production of books, letters, papers, records, and all other necessary articles. (d) The Auditor General may not hold any other public position while in office, nor engage in any activity that would conflict with official duties and