An individual taxpayer in the United States who cannot file an income tax return by the due date can obtain an automatic filing extension for what period of time:

a. Incorrect. Five days is the period in which to electronically resubmit a rejected e-filed individual tax return in order for it to be considered timely.

b. Incorrect. The two-month extension applies for taxpayers who are living outside the United States on the April filing deadline.

c. Incorrect. The automatic four-month extension applies for taxpayers living outside the United States who need more time after the June filing deadline to submit a return.

d. Correct. The automatic filing extension period for individuals is six months.