Use the sales array to answer. The array was declared using the int sales[5] = {10000, 12000, 900, 500, 20000}; statement.

a. while (x <= 4) 

x += 100; 

//end while 

b. while (x <= 4) 

{ 

sales = sales + 100; 

x += 1; 

} //end while 

c. while (sales < 5) 

{ 

sales[x] += 100; 

} //end while 

d. while (x <= 4) 

{ 

sales[x] += 100; 

x += 1; 

} //end while