Which of the following descriptions is true about fail$-$open and fail$-$closed configurations for security devices in the event of a failure?

A$.$Fail$-$open prioritizes confidentiality and integrity over availability, while fail$-$closed prioritizes availability over confidentiality and integrity.

B$.$Fail$-$open means that access is blocked or that the system enters the most secure state available, while fail$-$closed means that network or host access is preserved, if possible.

C$.$Fail$-$open means that network or host access is preserved, if possible, while fail$-$closed means that access is blocked or that the system enters the most secure state available.

D$.$Both fail$-$open and fail$-$closed prioritize confidentiality and integrity over availability.