An agent’s authority can be created:

only by expressly writing the terms thereof
only by implication
only by expressly writing the terms thereof and registering the same with sub-registrar
either expressly or impliedly

The correct answer is D. either expressly or impliedly.

An agent’s authority can be created either expressly or impliedly. Express authority is created when the principal gives the agent specific instructions on what they are authorized to do. Implied authority is created when the principal’s actions or conduct create an expectation in the agent that they have authority to act on the principal’s behalf.

For example, if a principal hires an agent to sell their house, the agent will have express authority to show the house to potential buyers and negotiate offers. The agent may also have implied authority to accept an offer on behalf of the principal, unless the principal has specifically told them not to.

It is important to note that an agent’s authority can be limited by the principal. For example, a principal may give an agent authority to sell a house for a certain price, but not for a higher price. If the agent sells the house for a higher price, the principal is not bound by the contract.

An agent’s authority can also be terminated by the principal. For example, a principal may terminate an agent’s authority to sell their house if they are not happy with the way the agent is handling the sale.

It is important for both principals and agents to understand the concept of agency law. This will help to ensure that all parties are aware of their rights and responsibilities.