What is the output of the following code: main$()$

char choice $=\text{'}\text{'}$A$\text{'}$

switch$($choice$)$

$\{$ case $\text{'}$A$\text{'}$: cout$$"Hello";

case $\text{'}$B$\text{'}$: cout$$"Aaup $"$;break;

default: cout$$"error";

$\}$

$\}$

Select one:

a$.$ Aaup

b$.$ Hello Aaup

c$.$ Hello Aaup error

d$.$ Hello