What is true of any ferromagnetic material?

It is a magnet.

It has two north poles.

It is difficult to magnetize.

It can be magnetized.

Option (1) and (4)

Explanation:

The ferromagnetic substance are those in which the each individual atom or molecule has a non zero magnetic moment.

They can be easily magnetized when placed in an external magnetic field.

For example, iron, cobalt and nickel.

They are used to make the magnets and they can be easily magnetized.