consider the following array declaration

int sales$[5]=\{10000,12000,900,500,20000\}$;

which of the following it$-$statement verifies that the array subscript stored in the variable is valid for the scalesarrayy?

a$,$ if$($x$>=0$&&x$<4)$

b if$($x$>=0$&&x$<=4)$

c if $($sales$[$x$]>=0$&&sales$[$x$]<4)$

d if$($sales$[$x$]>=0$&&sales$[$x$]<=4)$