Ais a collection of modems and other equipment in a local area that acts as an isp's gateway to the internet.

An point of presence (PoP) is a collection of modems and other equipment in a local area that acts as an ISP's gateway to the internet.  ISP stands for Internet Service Provider - the company that connects the client through his communications line to its servers, or central computer, which connects client to the internet via another company’s network access points.   The PoP is the interface point between communicating entities. 

B, it is easy to scan for key information. there are times when a lot of information is included in a business letter. the block letter format you find key bits of information quickly, without having to read through the whole paper.