What is the purpose of the fuel feed pump?

The fuel feed pump delivers fuel from the tank to the injection pump through the fuel filter.
The fuel feed pump is responsible for pressurizing the fuel system and maintaining a constant pressure.
The fuel feed pump is responsible for filtering the fuel before it reaches the injection pump.
The fuel feed pump is responsible for injecting fuel into the engine cylinders.
a) Only the first statement is correct.
b) Only the second statement is correct.
c) Only the third statement is correct.
d) None of the statements are correct.