A(n) ____ is a three- or four-letter suffix after a file name that distinguishes the file type.

For a list of length n, insertion sort makes ____ item assignments.

A. n(n-1)/4 B. n(n-1)/2 C. n2 D. n3

There are three uses for the three ____ buttons found on the Background Eraser Tool options bar: to erase colors continuously while dragging, to erase specific colored areas, and to erase areas containing only the current background color.

A. indexing B. opacity C. masking D. sampling