Which of the following are likely to be poor choices for an identifier in a program? Why?

a) x
b) RATE
c) data
d) _abc
e) A

a) x is too short to adequately describe a real world value.
b) RATE suggests a rate of speed, or interest perhaps.
c) data is perhaps a bit generic, nevertheless this writer would allow it.
d) _abc is not a word. It does not bring anything to this writer’s mind.
e) A is too short to adequately describe anything in the real world.

The answers to this question are subjective.