________ is an organization that has taken the lead in developing QoE estimators.

If you have saved the document with unwanted changes made by Replace All:

A) you can simply use the Backspace button. B) you will always be able to use the Undo option. C) you can simply click Delete. D) after a certain point there is no option but to make manual changes.

______ is the recommended technique for wireless network security.

A. Using encryption B. Using anti-virus and anti-spyware software C. Turning off identifier broadcasting D. All of the above