$3-15.$ Consider the following program:

$3$ How many times would the value of counter be printed:

A$.2$

B$.3.$

C$.4$

D$.8$

E$.10$

F$.$ none

$14.$ What is the value of counter printed in the first line of the output?

A$.2$

B$.3,$ C$.4$

D$.8$

E$.10$

F$.$ none

$15.$ What is the value of counter printed in the last line of the output?

A$.2$

D$.8$

B$.3$

C$.4$

E$.10$

F$.$ none