CCNP Wireless technology information
 

Have decided to take CCNP Wireless certification. Now, find the information from Cisco.com that it requires four exams:
642-737
642-747
642-732
642-742

These four exams are all for Cisco CCNP Wireless exam. However, my question is need I pass all these four exams for my CCNP Wireless certification, or only choose one for passing.