If f(x) ={x} + sin ax (where { } denotes...

If `f(x) ={x} + sin ax` (where { } denotes the fractional part function) is periodic, then

A

a' is a rational multiple of `pi`

B

a' is a natural number

C

a' is any real number

D

a' is any positive real number

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The correct Answer is:

A

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