One version of a(n) ____________________ is the Uniform Resource Locator (URL), which is used to identify the location of a resource on the Web.

You should select _____ margins if you want to control the space allocated for headers and footers.

A. Margins B. Predefined Margins C. Custom Margins D. Build Margins

The IO.File. ____________________ procedure checks if a file is available.

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