$24.$ Given the following code fragment

struct personStruct p;

struct personStruct q;

Which of the following is an error

A$.$ p$.$age $==$ q$.$age;

B$.$ p$.$age $=$ q$.$age;

C$.$ p $=$ q;

D$.$ p $==$ q;

E$.$ None of the above

$25.$ The default principal difference between stdout and stderr is:

A$.$ stdout refers to the keyboard; stderr refers to the display device.

B$.$ stdout can only be used for normal output; stderr can only be used for error output.

C$.$ stdout has buffered output to the display device; stderr has unbuffed output to the

display device.

D$.$ stdout can only be used in a printf function call; stderr can only be used in an

fprintf function call

E$.$ None of the above.