Consider the following array declaration

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

The statement sales$[4]=$ sales$[4-2]$; will replace the number $\_\_\_\_\_$

a$.$

$500$ with $498$

b$.$

$20000$ with $900$

c$.$

$20000$ with $19998$

d$.$

$500$ with $12000$