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What is the symbol of a decibel?

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What is the symbol of a decibel?

(a) dB

(b) Db

(c) DB

(d) db

This question was posed to me in homework.

I want to ask this question from The Decibel in division Low Frequency Transistor Amplifier Circuit of Electronic Devices & Circuits

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The correct answer is (a) dB

Easiest explanation: The decibel is a comparative unit of measurement equivalent to one tenth (deci) of a Bel unit. A Bel unit is expressed as B and hence the decibel is subsequently expressed by the symbol dB. They are a unit of a logarithmic scale to measure power or intensity levels.

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