Which of the Following Is an Advantage of Using DB

Which of the following is an advantage of using dB representations of gain values?

A) Positive and negative dB values represent gain and loss values that are reciprocals of each other.
B) In multistage amplifiers, gain calculations are simplified by the use of dB values.
C) Using dB values, we can represent large gain values with relatively small numbers.
D) All of the above.