Use the nums array to answer. The array was declared using the int nums[4] = {10, 5, 7, 2}; statement. The x and total variables are int variables and are initialized to 0. The avg variable is a double variable and is initialized to 0.0. 

Which of the following will correctly calculate the average of the elements included in the nums array? 

a. while (x < 4) 

{ 

nums[x] = total + total; 

x += 1; 

} //end while 

avg = static_cast(total) / 

static_cast(x); 

b. while (x < 4) 

{ 

total += nums[x]; 

x += 1; 

} //end while 

avg = static_cast(total) / 

static_cast(x); 

c. while (x < 4) 

{ 

total += nums[x]; 

x += 1; 

} //end while 

avg = static_cast(total) / 

static_cast(x); 

c. while (x < 4) 

{ 

total += nums[x]; 

x += 1; 

} //end while 

avg = static_cast(total) / 

static_cast(x) – 1; 

d. while (x < 4) 

{ 

total += nums[x]; 

x += 1; 

} //end while 

avg = static_cast(total) / 

static_cast(x - 1);