Choose the sentence that is punctuated correctly.
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O a. The U.S. Treasury depends, for the bulk of its revenues, on the tax funds
collected by the Internal Revenue Service, IRS.
The U.S. Treasury depends, for the bulk of its revenues, on the tax funds
collected by the Internal Revenue Service (IRS).
The U.S. Treasury depends, for the bulk of its revenues, on the tax funds
collected by the Internal Revenue Service [IRS].