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If an NMOS is degenerated by a resistor in series with the source, what will happen to the output resistance?

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If an NMOS is degenerated by a resistor in series with the source, what will happen to the output resistance?

(a) It increases

(b) It decreases

(c) It remains same

(d) Cannot be determined

I had been asked this question during a job interview.

I'd like to ask this question from MOSFET Amplifier with CS Configuration topic in portion FET Amplifiers of Analog Circuits

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The correct option is (a) It increases

The explanation: This is a fact derived by performing the small signal analysis of a degenerated C.S. stage. The output impedance increases if we degenerate the MOSFET and this further increases the linearity of operation.

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