What is the fire insurance precautions that when installed and taken by the insured minimize insurance premium rate as well as risk?

One or all of the under mentioned precautions :-

A) Fire extinguishers ( should be in an operational condition and always ready to be used )

B) Fire alarm.

C) Fire sprinklers.

D) Water hoses.

E) twenty four hours guards should be available  in respect of business premises.

Thanking you.