The correct answer is A. Volatile.
RAM (Random Access Memory) is a type of computer memory that can be accessed randomly, meaning that any byte of memory can be accessed without touching the preceding bytes. RAM is typically used as the main memory in a computer, and it is used to store data and programs that are currently being used.
RAM is volatile, which means that it loses its contents when the power is turned off. This is in contrast to non-volatile memory, such as hard drives and flash drives, which retain their contents even when the power is turned off.
The reason why RAM is used as a short memory is because it is volatile. This means that it can be quickly accessed and changed, which is necessary for running programs and storing data. However, it also means that the data in RAM is lost when the power is turned off. This is why programs and data that need to be saved permanently are stored on non-volatile memory.
The other options are incorrect for the following reasons:
- Option B: RAM can have a large capacity, depending on the type of RAM and the computer.
- Option C: RAM is not very expensive, especially compared to other types of memory, such as solid-state drives.
- Option D: RAM is not programmable, in the sense that it cannot be used to store programs or data.
- Option E: None of the above is the correct answer.