Consider a form that has two buttons:

btnComputeCost: computes the sub total and total cost for an order.

btnDisplay: intended to display the sub total in a ListBox named lstDisplay.

The click event handlers of the two buttons look as follows:

private void btnComputeCost$\_$Click$($object sender$,$ EventArgs e$)$

$\{$

$//($statements to declare and assign values to unitPrice and number of

$//$scoops go here$)$

double subTotal;

subTotal $=$ unitPrice $*$ scoops;

$//($statements to compute total cost go here$)$

$\}$

private void btnDisplay$\_$Click$($object sender$,$ EventArgs e$)$

$\{$

lstDisplay.Items.Add$($subTotal$.$ToString$())$;

$\}$

The following statement is true about the variable subTotal:

Consider a form that has two buttons:

btnComputeCost: computes the sub total and total cost for an order.

btnDisplay: intended to display the sub total in a ListBox named lstDisplay.

The click event handlers of the two buttons look as follows:

private void btnComputeCost$\_$Click$($object sender$,$ EventArgs e$)$

$\{$

$//($statements to declare and assign values to unitPrice and number of

$//$scoops go here$)$

double subTotal;

subTotal $=$ unitPrice $*$ scoops;

$//($statements to compute total cost go here$)$

$\}$

private void btnDisplay$\_$Click$($object sender$,$ EventArgs e$)$

$\{$

lstDisplay.Items.Add$($subTotal$.$ToString$())$;

$\}$

The following statement is true about the variable subTotal:

A$.$ the statement that displays subTotal within lstDisplay$\_$Click is invalid because the variable subTotal cannot be accessed from lstDisplay$\_$Click method.

B$.$ subTotal can be accessed from any statement $($before or after its declaration$)$ within the method, btnComputeCost$\_$Click

C$.$ subTotal can be accessed only from statements that follow its declaration within the method, btnComputeCost$\_$Click

both A and C are true