B

Step 1: Understanding the basic concepts.
Henry (H) is a derived unit in the International System of Units (SI) that measures inductance. Inductance refers to the tendency of an electrical conductor to oppose a change in current flowing through it.
Step 2: Identifying types of inductance. There are two significant types of inductance:

• Self inductance: This is the property of a single coil (or conductor) where a change in current through it induces an electromotive force (emf) in the same coil.
• Mutual inductance: This is the property where a change in current in one coil induces an emf in another nearby coil.

Step 3: Conclusion. Since Henry is the unit that describes both self inductance and mutual inductance, the correct answer is Option B: Mutual inductance both.