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Given below are two statements, one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A): Threshold frequency is the maximum frequency required for the ejection of electron from the metal surface.

Reason (R): Threshold frequency is the characteristic of a metal. In the light of the above statements, choose the correct answer from the options given below:

A
A is true but R is false.
B
A is false but R is true.
C
Both A and R are true and R is the correct explanation of A.
D
Both A and R are true but R is NOT the correct explanation of A.
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