Making of election; revocation

An election described in this subsection with respect to any taxable year may be made by filing a joint return in accordance with subsection (a) and under such regulations as may be prescribed by the Secretary. Such an election may be revoked by either spouse on or before the due date (including extensions) for such taxable year, and, in the case of an executor or administrator, may be revoked by disaffirming as provided in the last sentence of subsection (a)(3).