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Which of the following is true about TFA's 'corps members' and 'alums'?
A.
The corps members stay in schools after finishing their two-year teaching.
B.
The alums don't stay in schools after finishing their two-year teaching.
C.
A corps member will be an alum after finishing the two-year teaching.
D.
A corps member becomes an alum if he or she has quitted halfway.