Market capitalisation can be defined as which ONE of the following?

$($a$)$ The total number of authorised shares multiplied by the current share price

$($b$)$ The total number of authorised shares multiplied by the fair value share price

$($c$)$ The total number of issued shares multiplied by the book value share price

$($d$)$ The total number of issued shares multiplied by the current share price

$($e$)$ None of the above