Android 6.0 Ignore Optimisations, Power Usage Firewall. Protected Apps

[AC Question]

Hello.

1. When specified app is in Ignore Optimisations list as "Allowed", does it mean that:
a. This app is allowed to optimize
b. This app is allowed to ignore optimisation (run as usual when Doze is ON)

2. When specified app is in Protected Apps list (as "Protected"), what is doing option "Power-intensive" if turned ON?
a. Restricting some features or services of this app
b. Allows Android to ignore warning about unusual (too high) battery use for this app and run it as usual
c. Other

3. What does selection (green tick) for specified app in Power Usage Firewall list? Does it affect somehow to app work/use?

Thanks in advance