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What is the output as a function of the input voltage (for positive values) for the given figure. Assume it’s an ideal op-amp with zero forward drop (Di=0)

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What is  the output as a function of the input voltage (for positive values) for the given figure. Assume it’s an ideal op-amp with zero forward drop (Di=0)

(a) 0

(b) -Vi

(c) Vi

(d) 2Vi

I have been asked this question in a national level competition.

This interesting question is from Half-Wave Rectifier topic in section Application of Diodes of Electronic Devices & Circuits

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The correct answer is (c) Vi

Easiest explanation: When the input of the inverted mode op-amp is positive, the output is negative.

The diode is reverse biased. The input appears at the output.

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