Question: What is the main difference between these two Functions?

1. `lock()` has a higher privilege over `try_lock()`. This means that you have a better chance of acquiring a mutex `with lock()`.
2. Both attempt to acquire a lock, but `lock()` blocks if the mutex is not available, whereas `try_lock()` returns whether the mutex is available or not.
3. `lock()` enforces preemption, whereas `try_lock()` suggests preemption.
4. If the mutex is not available, `try_lock()` returns with a corresponding code, whereas `lock()` snatches the mutex from the thread that currently has it.

Answer: The correct answer of the above question is Option B:Both attempt to acquire a lock, but `lock()` blocks if the mutex is not available, whereas `try_lock()` returns whether the mutex is available or not.