The BlockingQueue interface declares which two methods for blocked adding and blocked removing of elements from a circular buffer?

When an argument is passed by __________, only a copy of the argument's value is passed into the parameter variable.

a. value b. reference c. return d. hand

A(n) _______________ is used to call a recursive function, and it may check for possible errors before calling the function.

A. main program B. class function C. overloaded operator function D. driver