The items below list several e-mail practices. If the practice describes something workers should do when using e-mail for business purposes, select Do. If the practice describes something workers should not do when using e-mail for business purposes, select Don't. include a signature.

include lots of exclamation marks to get your point across.

include the thread of previous messages.

make e-mail messages brief.

always mark messages as urgent so your e-mails will be read first.

use a relevant subject line.

use all capital letters when the message is urgent.

Aproduction line has three machines a, b, and c, with reliabilities of .96, .86, and .85, respectively. the machines are arranged so that if one breaks down, the others must shut down. engineers are weighing two alternative designs for increasing the line’s reliability. plan 1 involves adding an identical backup line, and plan 2 involves providing a backup for each machine. in either case, three machines (a, b, and c) would be used with reliabilities equal to the original three. a. compute overall system reliability under plan 1. (round your intermediate calculations and final answer to 4 decimal places.) reliability b. compute overall system reliability under plan 2. (round your intermediate calculations and final answer to 4 decimal places.) reliability c. which plan will provide the higher reliability? plan2plan1