Attending to a message means to focus briefly on a part of a particular message

Viral marketing proved to be an effective tactic ________

A) following the SARS outbreak in Canada in 2003 B) with the introduction of the personal computer in 1977 C) that led to the election of Bill Clinton as U.S. president in 1992 D) with the introduction of Microsoft's Vista operating system in 2005 E) that helped the Allies counter Nazi propaganda in World War II

Describe the major types of microphones and the advantages and disadvantages of each.

What will be an ideal response?