Andy originally reported $21,000 as his adjusted gross income on his 2019 form 1040 he received another form W-2 for 500 after he filed his return which of the following is true?

A. andy he should file another form 1040 for 2019
B. Andy should re-file form 1040 for 2019
C. Andy should include the 500 on his 2020 form 1040
D. Andy should use form 1040 X amended US individual income tax return to correct a 2019 form 1040