Hari has been employed by Telnet Softtech Ltd$.$ as a senior network engineer. Analyze which of the following statements he should keep in mind while visiting the data room of a multinational company for monitoring and security purposes.

a$.$ No environmental alarms can be programmed.

b$.$ He should have the HVAC sensors connected as network devices themselves.

c$.$ The servers and switches cannot contain temperature sensors$,$ and so they have to be installed.

d$.$ Every data room can have unlimited IT personnel with copies of the keys.