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What is the Thevenin’s resistance (RTH) in a self bias shown below?

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What is the Thevenin’s resistance (RTH) in a self bias shown below?

(a) R1R2/R1+R2

(b) R2/R1+R2

(c) R1R2/R1-R2

(d) R1/R1-R2

This question was posed to me in an online interview.

Query is from Self-Bias in chapter Transistor Biasing and Thermal Stabilization of Electronic Devices & Circuits

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The correct option is (a) R1R2/R1+R2

For explanation I would say: The base current cannot be obtained directly from the KVL or KCL applications. A potential divider network is formed by R1 and R2.The VCC and VBE cannot come under a single equation. So, the circuit is changed with a Thevenin’s resistance.

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