Given that int n has already been declared as a non$-$constant variable and has been initialized to a positive value, declare nums to be an array of integers whose size is n$.$

int $*$nums $=$ new int$[$n$]$;

int nums$[$n$]$;

int nums$[]=\{$n$\}$;

One cannot declare an array with a non$-$constant size in C$++.$