Which code segment will show field-specific help at the user s request during an INPUT statement?

Which code segment will show field-specific help at the user s request during an INPUT statement?
A . ON KEY (F1)
CASE
WHEN infield(a)
CALL showhelp(1)
WHEN infield(b)
CALL showhelp(2)

END CASE

B . INPUT BY NAME r_record.* HELP var
BEFORE FIELD a
LET var = 1
BEFORE FIELD b
LET var = 2

END INPUT
C . ON KEY (F1)
CASE
WHEN infield(a)
showhelp(1)
WHEN infield(b)
showhelp(2)

END CASE
D . INPUT BY NAME r_record.*
BEFORE FIELD a
CALL showhelp(1)
BEFORE FIELD b
CALL showhelp(2)

END INPUT

Answer: A

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