What type of web server application attacks introduce new input to exploit a vulnerability?

In Excel, you can group worksheets to enter a footer into two worksheets at a time, by pressing the ________ key while selecting the worksheets before inserting the footer.

a. Home b. Alt c. Ctrl d. Esc

In BNF, the ____ is used to separate two alternative definitions of a nonterminal.

A. forward slash B. vertical bar C. backward slash D. asterisk