Final answer:
Remission signifies that the disease is present, but the client is not experiencing symptoms.
Step-by-step explanation:
A client who has breast cancer and is said to be in remission means that the disease is present, but the client is not experiencing symptoms (option D). Remission refers to a period when the signs and symptoms of cancer disappear, and the cancer cannot be detected using tests. However, it is important to note that remission does not mean that the cancer has been cured or will not come back in the future.