A(n) ________ is a control that has a text box and a list that is hidden until its arrow is clicked

A packet analyzer is a program that can enable a hacker to do all of the following EXCEPT ________

A) assume your identity B) steal your logons and passwords for various accounts C) launch a denial of service (DoS) attack on your computer D) use your debit card information to purchase items illegally

A ________ occurs when the cell that contains the formula results is included in the formula argument

A) comparison operator B) circular reference C) conditional function D) null reference