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Is the given solution verified?
I thought a service-policy is used to apply a QoS policy (poicy-map) to an interface
and that you can enforce (define) rate-limiting with a policy map.
From a configuration point of view, which data (class-map), which action (policy-map), is imposed on which interface (service-policy).
...and "policing" I would call a technique or mechanism and not a tool, so I am a bit confused by the given solution

I agree with the following 3 points in the given answer:

• DSCP => portion of the IP header used to claccify packets
  

• CoS => portion of the 802.1Q header used to classify packets
  
• Policing => tool to enforce rate-limiting on ingress/egress
  

...and then I see the following connections:

• Shaping is a bandwidth management technique which delay datagramms.
  

• Service Policy is a mechanism to apply a QoS policy to an interface.
  for example:
  interface serial 1/0
    service-policy output myPolicyMap
  

• Policy Map is a mechanism to create a scheduler for packets prior to forwarding.
  for example:
  policy-map MyPolicyMap
   class VIDEO
     bandwidth 256
   class BUSINESS
     bandwidth 256
   class class-default
     fair-queue
  (so here we have queues for different priority data and they need a CBWFQ scheduler)
  

Agree with my suggestion? And the big question, how does cisco think?

im uitte sure you are right. i failed encor in january but i leaned a valuable lesson. to trust my knowledge. i remember on question from a site and the answer was wrong. regarding your question i think you are correct.

Ok, fixed it.