Within the principal$/$agent perspective of PAT, the price$-$protection approach is:

A: the principal pays the agent a lower salary on the basis that the agent is expected to undertake opportunistic behaviour.

B: the contract between the principal and agent includes a clause that stipulates the basis for pricing of goods so that the agent does not price the product too highly in an effort to increase the agent's short$-$term rewards.

C: the contract between the principal and the agent specifies a period within which the price paid for the services of the agent cannot be changed.

D: the contract between the principal and the agent includes an agreement whereby the agent guarantees the price of the shares in the company will be protected by the agent's actions.