What is an alternative term for "clicking" a link?

A file compressed with________ compression can be decompressed with no loss of data

Fill in the blank(s) with correct word

Return by reference was used for the overloaded [ ] operator function of the Array class because:

A. it is possible that an invalid index of the Array might be accessed B. the function call for this function might appear on the left of an assignment C. the function was inlined D. conditional compilation was used