The _____ gallery has a wide variety of preset formatting combinations for coloring pictures.

What is the output of the following code?

``` void f() { cout << 1 << endl; } int main() { f(); return 0; } ``` A. nothing B. 1 C. 0 D. 0 1 E. 1 0

Some tags are ____________________, occurring only as single tags.

Fill in the blank(s) with the appropriate word(s).