Question: (a) What does an SA specify? (Do not just spell SA out.) (b) When two parties want to communicate in both directions with security, how

(a) What does an SA specify? (Do not just spell SA out.)
(b) When two parties want to communicate in both directions with security, how many IPsec SAs are necessary?
(c) May there be different SAs in the two directions?
(d) What is the advantage of this?
(e) Why do companies wish to create policies for SAs?
(f) Can they do so in SSL/TLS?
(g) How does IPsec set and enforce policies?

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