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What are the functions of the SDA and SCL pins of the Arduino UNO?

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What are the functions of the SDA and SCL pins of the Arduino UNO?

(a) They facilitate I2C communications

(b) They facilitate SPI Communications

(c) They facilitate USB Communications

(d) They facilitate Ethernet Communications

I got this question during an interview.

This intriguing question originated from Board Pinout Structure topic in section Board Specifications and Types of Arduino

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The correct choice is (a) They facilitate I2C communications

Best explanation: The SDA and the SCL pins on the Arduino UNO are used for communicating through the I2C protocol. They are supported by the Wire Library in the Arduino IDE which supports the 7-bit addressing mode.

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