In the standard RGB color model, each color channel $($Red$,$ Green, Blue$)$ is typically represented by $8$ bits. Therefore, to represent a single color in the RGB model, we need:

$8$

bits $($Red$)$

$+$

$8$

bits $($Green$)$

$+$

$8$

bits $($Blue$)$

$=$

$24$

bits

$8$ bits $($Red$)+8$ bits $($Green$)+8$ bits $($Blue$)=24$ bits

So$,$ the correct number of bits needed to represent a color in the RGB model is:

$24$

The correct answer is:

$24$