A(n) informs the compiler that a class will be declared later in the program. a. static function b. private data member c. forward declaration d. object conversion e. none of these

Option (c) is the correct answer for the above question.

Explanation:

A Forward declaration is a concept in which any variable or function is defined before its use. It uses to define their data type and argument types to tell the compiler, that how much memory they need to reserve to store the data.

Actually, execution starts from the "main function" starting block and ends on the "main function" ending block. When any function or variable definition is given by the user after the "main function" then a user needs to declare a prototype of that function or variable before the starting of the "main function" to tell the compiler that how it looks. i.e known as the concept of Forwarding declaration.

The above Question also states the above concept hence option c will complete the question statement. while the other option is not correct because--

answer ingress;

the answer is b. executive summary. a management summary, or executive summary, is a short article or section of a document, produced for business purposes, that condenses a longer report or proposal or a group of related reports in such a way that readers can rapidly become familiar with a large body of material without having to read it all.