Which of these wireless transmission types is limited to line-of-sight communications?

Both Surface covers come with a built-in ________

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

A very large organization proves to have over 30 million emails in its database. You are looking for all messages that are related to a drug transaction that occurred between two employees. You know they didn't use obvious phrases, such as "drug deal" to describe their transaction, so you are looking for phrases that sound innocent, but mean the same thing. What technology would allow you to make

such a search? a. User Modeling b. Messsage Profiling c. Content Filtering d. Concept Searching