?To center an element vertically within its parent element, display the parent element as a table cell with a defined height and then set the vertical-align property to _____.

A ________ is a category of information such as the date or page number that can be added to a document

Fill in the blank(s) with correct word

What is the result of the command exec("ls -la"); when run on a UNIX system?

a. returns a list of recently deleted directories b. returns a directory listing from the host server c. runs an external command in the user's browser d. runs a stored procedure on the web server