a) not currently

b) it's potentially possible but we are not changing our current policy to accommodate

c) NO

d) always have had that choice. no change.

e) always have had that choice. no change.

Nothing you listed will be effected by policy changes in a post pandemic world.
The biggest effect for us on travel is the lack of it and the expected reduced volume. Beyond that, which is massive, the policy itself has not changed.