Final answer:
In computer forensics investigations, RAM data is considered volatile and can be lost when power is removed from the computer.
Step-by-step explanation:
In computer forensics investigations, the type of data considered volatile and which can be lost if power is removed from the computer is c. RAM data. Volatile memory, such as Random Access Memory (RAM), temporarily stores data that a computer needs to carry out active processes. Once the computer is turned off or loses power, the data stored in RAM is lost because it requires continuous power to maintain the information. In contrast, registry data, hard drive data, and backup data are examples of non-volatile storage, which retain data even when power is not supplied.