Which of the following characteristics of an e-mail header should cause suspicion? a. multiple recipientsb. no subject linec. unknown sender

The correct answer for the given question is option(b) i.e " No subject line"

Explanation:

In the e-mail subject is the important part which describe the information which kind of particular mail is send or received .if we do not give any subject line in the e-mail header then most of the chances that email will not read by recipients due to this suspicion will be caused.

Unknown Sender and Multiple recipients do not cause suspicion so the correct answer is option(b) i.e No subject line".

solution:

this situation is called an ip conflict.

data from a server is sent in small bits called packets. in an ip conflict, some packets will end up in one computer while some other packets will end up in another computer.

so…overall none of the computers get the data as the original message or picture being sent by the server cannot be retrieved with only half the packets. so it will show up as an error.

thus the final answer is d.