A nurse is instructing a client on the maintenance of their cast. Which of the following instructions should be given to the client?

A. Tightness and pain can indicate complications such as impaired circulation or compartment syndrome and should not be considered normal. These symptoms should be reported immediately. B. Clients should not trim or alter their cast. Doing so can compromise the integrity of the cast and increase the risk of injury or skin damage. C. Inserting objects under the cast to relieve itching is unsafe and can cause skin injury or infection. Instead, clients should be advised to blow cool air under the cast or tap on the cast to relieve itching. D. It is appropriate to shower with a cast if it is completely dry and covered with a waterproof plastic covering, which helps protect the cast from moisture and potential skin breakdown.