o maintain reasonable key security (mark all that apply): Ensure that someone else always has an extra key. Ensure that no extra duplicates are made. Maintain strict control over master keys and control keys. Ensure that the key cannot be linked to the lock it operates.

The answer is "second, third, and fourth choices"

Explanation:

In the question the numbering of the choices were missing if we numbering the choices so, the first choice will be one first number and second choice is in second and so on, and its explanation can be defined as follows:

The network safety key is a type of network login credentials or passwords which is used for provides authorization as well as access the network or device upon which client requests to communicate throughout the form of physical, digital, or biometrical information login.  

It doesn't ensure the extra key.  It helps ensure there were no additional duplicates.  It keeps strict access codes as well as keys command.  It makes sure, that its key could not be linked to able to operate the lock.

Through the process of sedimentation,sediment is turned back to rock to form sedimentation.the process of sedimentation is: > deposition-where fragments were deposited into the river or sea under gravity or travelling agent such as wind or water. > sedimentation-the fragments deposited in the river sedimented and accumulate> compaction-the layers of fragments deposited undergoes compaction due to the weight if the upper layers> cementation-chemical substance of the fragments such as cement dissolved into the water and cement the other fragments together to form sedimentary rock.thus,cementation and compaction are the process.on the other hand, transformation only occur when a rock under goes metamorphism(compaction or extreme heat).while recrystillization occurs when a rock is melted and cooled down,which also requires metamorphism to take place.hope it !