The core of electromagnets are made of ferromagnetic material like soft iron because the soft iron has-

High permeability and low retentivity

The correct answer is Option (2) → High permeability and low retentivity

High permeability means the material can easily become magnetized when exposed to a magnetic field, which makes soft iron a good choice for electromagnets.

Soft iron low retenivity helps it behave as a temporary magnet that only exhibits magnetism when electric current is applied.