Which of the following statements are correct in respect of magnetic materials with magnetic susceptibility \(\frac{M}{H} = \chi ?\)1. χ is dimensionless2. The relative permeability of the medium equals 1 + χ.3. For non-magnetic medium, χ equals – 1.Select the correct answer using the code given below.

• A. 1, 2 and 3
• B. 1 and 3 only
• C. 2 and 3 only
• D. 1 and 2 only