Consider the following statements :
1. Availability is generally conserved.
2. Availability can either be negative or positive.
3. Availability is the maximum theoretical work obtainable.
4. Availability can be destroyed in irreversibilities. Of these statements
(a) 3 and 4 are correct
(b) 1 and 3 are correct
(c) 1 and 4 are correct
(d) 2 and 4 are correct.
