In order for the XSL code to be valid, the _______ line of HTML must be present.

To add a tile to a group, ________ it and drag it into that group

A) Ctrl + click B) double-click C) left-click D) right-click

___________ is a new type of Magnetic RAM, which features non-volatility, fast writing/reading speed, and high programming endurance and zero standby power.

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