Which of the following statements does not overwrite a preexisting value stored in a memory location?

The use of a live message center for text-based exchanges when users are active at the same time is called a ________

A) webcam B) podcast C) chat D) none of the above

A(n) ________ is a programmer-defined name in VBA that stores a value which can change while an application is running

A) conditional compiler constant B) symbolic constant C) intrinsic constant D) variable