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When does the transistor act like an open switch?

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When does the transistor act like an open switch?

(a) cut off region

(b) inverted region

(c) saturated region

(d) active region

The question was asked during an interview.

The query is from The Junction Transistor topic in chapter Transistor Characteristics of Electronic Devices & Circuits

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Correct option is (a) cut off region

Easy explanation: In cut off region, both the junctions are reverse biased. The transistor has practically zero current because the emitter does not emit charge carriers to the base. So, the transistor acts as open switch.

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