In a ferromagnetic material, what is the size of a typical domain and how many atoms does an individual domain approximately contain?

Which of the following statements is correct about ferromagnetic materials?

Which of the following statements is correct about anti-ferromagnetic materials?

Given below are two statements regarding a ferromagnetic material: Assertion (A): The individual atoms in a ferromagnetic material possess a magnetic dipole moment and interact with one another in such a way that they spontaneously align themselves forming domains. Reason (R): At high enough temperature, the domain structure of a ferromagnetic material disintegrates. Thus, magnetization will disappear at a high enough temperature known as the Curie temperature. In the light of the above statements, choose the correct answer from the options given below: