The statement

stackitems $[0]=$ stackitems $1$;

$($setting the top element equal to the second element$)$ in a client program of the stack class

Select one:

a would ciuse a run$-$time error.

b would cause a syntax error at compile time:

c would be a perfectly legal and appropriate way to accomplish the intended task$-$

d$.$ would not beconsidered an error by the computer, but would violate the encapsulation of the stack data type: