Rewrite the following sentences and the meaning stays the same.
I haven’t seen my old school friend for 2 years.
A.The last time I saw my old school friend has been 2 years ago
B.The last time I saw my old school friend was 2 years ago.
C.The last time I saw my old school friend is 2 years ago
D.The last time I have seen my old school friend was 2 years ago