Explanation:

- Understanding Semaphores in Computing:

- Semaphores are synchronization tools used to control access to shared resources in concurrent programming.

- Binary Semaphore: Also known as mutex, these can only be 0 or 1, thus cannot be non-negative integers other than these two values.

- Counting Semaphore: Can take non-negative integer values and is used to manage multiple instances of a resource.

- Real Semaphore: Not a standard term in semaphore terminology.

- Option Analysis:

- Option 1 - Binary Semaphore: Incorrect, as it only holds 0 or 1.

- Option 2 - Counting Semaphore: Correct, because it can take a wide range of non-negative integer values to manage multiple resources.

- Option 3 - Real Semaphore: Incorrect, as it's not a recognized concept.

- Option 4 - All of the above: Incorrect, given the explanation above.

- The correct answer is Counting Semaphore from Option 2.