For each of the following requirements, identify the best choice of degree of

durability in a remote backup system:

a$.$ Data loss must be avoided, but some loss of availability may be tolerated.

b$.$ Transaction commit must be accomplished quickly, even at the cost of

loss of some committed transactions in a disaster.

C$.$

A high degree of availability and durability is required, but a longer run$-$

ning time for the transaction commit protocol is acceptable.