Q1:
Functions can be declared to return a reference type. There are reasons to make such a declaration/Which of the following reasons are correct?

The information being returned is a large enough object that returning a reference is more efficient than returning a copy.

The type of the function must be a R-value.

Question

Q1:

Functions can be declared to return a reference type. There are reasons to make such a declaration/Which of the following reasons are correct?

The information being returned is a large enough object that returning a reference is more efficient than returning a copy.
The type of the function must be a R-value.

References