question on how the game works

is it A. enter lobby, get kills and objectives which gives money, with that money i can buy better stuff for that match

or B. each match i earn and lose money and then the next match can spend money I have previously banked like an extraction shooter.

if B. how does going broke work? can i get rich enough where i just start a match in a tank or god armor that no one else can afford to kill at start of match or what? im just confused how the system works and watching trailers isn't really answering.