Suppose isPositive(X) evaluates to True when X is a positive number, and False otherwise. If X = -2, which of the following is not true about isPositive(X)?单项选择题

A

a. It is a predicate.

B

b. It is unary.

C

c. It is a function.

D

d. It is a proposition.

E

e. It is a constant.

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