1. A zero-buffer consumer-producer problem solution that does not involve busy waiting is equivalent to a blocking send/receive messaging system. True or False?

2. If used within a single thread, a binary semaphore is equivalent to a mutex. True or False?

3. A POSIX thread can wait on a mutex and an associated condition variable at the same time. True or False?

4. A monitor solution to the producer-consumer problem naturally supports multiple producers and multiple consumers. True or False?