Assume That for a Data Field, Only the Codes 1

Assume that for a data field, only the codes 1 or 2 should appear. If a researcher mistakenly inputs any other number (say, 3) , an error message is immediately displayed on the screen. This indicates that the software being used for data entry probably has a(n) :

A) data input detection system.
B) input error capture mechanism.
C) error edit routine.
D) catch-error template.
E) outlier detection routine.