What is not a group on the Report Layout Tools Format tab?

A variable that is used to reference an object is commonly called a(n) ____________.

a. reference variable b. object variable c. class variable d. Boolean variable

template ____ doublyLinkedList::isEmptyList() const{      return (first == nullptr);} Consider the accompanying statements. The operation returns true if the list is empty; otherwise, it returns false. The missing code is ____.

A. protected B. int C. void D. bool