A file ____ refers to the internal characteristics of digital files; it designates the operational or structural characteristics of a file.

The "^" and "$" characters represent:

a. back references b. the beginning and end of a string c. the beginning and end of a regular expression d. none of the above

All event-handler take two parameters. The first parameter, object sender, represents the source that raises the event, and the second parameter is the data for the event; thus, they normally have the same ____________.

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