c, long term can be a collapse long term of collapse tomorrow, also maybe an EMP attack, Sun flare, Nuclear, cyber attack. So there are many and more likely that when it happens no one though it was coming at the time. So we have to have some things prepared and ideas on where to find food and water if you are at the time in a city or town.
I personally believe it will be an economical collapse but the government may do a false flag before like a war, an EMP etc to have the world not see the real problem of the collapse and blame the collapse on the false flag event. So we may not be ready when it happens.