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The discrete-time signal x (n) = (-1)^n is periodic with fundamental period

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The discrete-time signal x (n) = (-1)^n is periodic with fundamental period

(a) 6

(b) 4

(c) 2

(d) 0

I got this question in a national level competition.

The above asked question is from The Z-Transform in division Digital Control Systems of Control Systems

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Right answer is (c) 2

The explanation: Period of the signal refers to the instant of time at which the signal repeats itself and for this Period =2 of the given discrete time signal.

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