Consider the following statements about the cache memory :
1. It is a non-volatile memory.
2. It is a slow-read and inexpensive memory.
3. It is a fast-read and expensive memory.
4. It is a small-sized memory.
Which of the above statements are correct ?
Select the correct answer using the codes given below :

Cache memory is a high-speed semiconductor memory that acts as a buffer between the CPU and the main memory (RAM) to speed up data access. Evaluation of the statements:

• Statement 1 is incorrect: Cache memory is volatile memory, meaning it requires power to maintain the stored information.
• Statement 2 is incorrect: It is significantly faster and more expensive per bit than RAM or secondary storage.
• Statement 3 is correct: It is designed for fast-read access to store frequently used instructions and data, reducing the time the CPU waits for data from the main memory.
• Statement 4 is correct: Due to its high cost and complexity, it is small-sized, typically ranging from a few Kilobytes to several Megabytes (L1, L2, and L3 caches).

Therefore, statements 3 and 4 are correct.