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Understanding redundant parts of C++ function declarations versus definitions

This is a medium-difficulty C++ language-knowledge question that tests whether you understand the formal rules governing how declarations and definitions relate to one another. It rewards precision about what the compiler actually requires in each context.

When you split a function declaration (in a header file) from its definition (in an implementation file), not every syntactic element that appears in the declaration must be repeated in the definition. The question asks you to identify which parts of a declaration are optional or implicit when you write the corresponding definition. This touches on scope, linkage, and the C++ standard's rules about declaration–definition matching.

• Differences between declarations and definitions
• Function signature components: return type, parameter names, default arguments
• Storage class specifiers and their scope
• Redundancy rules across translation units