John qualified for an exemption from withholding in 2019. He also qualifies for an exemption from withholding for 2020. How does he inform his employer?

A) He will complete Step 1 only of Form W-4.

B) He can inform his employer by letter of his exemption.

C) Since he already qualified in 2019, no further action is required on his part.

D) He will submit Form W-4 and write "Exempt" on the form in the space below line 4 (c) and complete Steps 1(a), 1(b), and Step 5.