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Which of the following is not an advantage of using a LED?

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Which of the following is not an advantage of using a LED?

(a) High response time

(b) Compatibility with solid-state circuits

(c) Rugged construction and high lifetime

(d) No need for a heat sink in long run

I had been asked this question during a job interview.

This question is from Types of Diode and their Testing in section Diode Circuit of Analog Circuits

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The correct answer is (d) No need for a heat sink in long run

To explain: The response time of a LED is typically in the order of nanoseconds. The operating voltage range for LED is between 1.7 V to 3.3 V which makes it compatible with solid-state circuits. Also, the semiconductor construction makes them rugged. However, in the long run, an adequate heat sink is required for longevity.

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