Given the form in the exhibit, which code segment would properly add 10 to the input contents of field a and display the results in field b?

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Given the form in the exhibit, which code segment would properly add 10 to the input contents of field a and display the results in field b?
A . AFTER FIELD a
LET r_record.b = r_record.a + 10
DISPLAY BY NAME r_record.b
B . BEFORE INPUT
LET r_record.b = r_record.a + 10
DISPLAY BY NAME r_record.b
C . AFTER FIELD a
NEXT FIELD b
LET r_record.b = r_record.a + 10
D . ON KEY (F3)
NEXT FIELD a
LET r_record.b = r_record.a + 10

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Answer: A