The word "obsolescence" in paragraph 4 means______

A．Because you have not accumulated enough experience.
B．Because a rich repertoire of experience has been accumulated.
C．Because you need to stay on top of emerging technologies.
D．Because you have worked in the same area for too lon

A．Certification is very common; so you need to get certified, too.
B．Certification is needed in a wide variety of fields, so may be in yours.
C．Certification is varied because of more emerging careers and areas.
D．Certification is becoming more and more important for every on