Given the options, I would choose Option C. =B1+B2+B3+B4+B5.
Typically the contact details for the firm would be at the bottom of the flyer.
This is to allow room for the main event itself to be advertised in top and central area of the flyer real-estate.
The word DoS refers to the Disk Operating System. In the case given above, if it happens that there is a distributed DoS attack, the attacker then sends messages directly to the BOTS. Bots refer to internet or web robots. Hope this answer helps. The answer is the first option.
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