All #FreeSoftware licenses are compatible with each other - True or false?

a) True. All Free Software-licensed code can be combined in the same software project

b) True. All Free Software-licensed code become copyleft licensed when combined in the same software project

c) False. Some Free Software licenses, and particularly copyleft licenses, can create license incompatibilities

d) False. Free Software-licensed code must only be combined and reused with code with the same license