What are the differences between Call Pickup and Group Call Pickup?

A.
Call Pickup permits the pickup of incoming calls within their own group, while Group Call Pickup allows users to pick up incoming calls within their own group as well as any other group.

B.
Group Call Pickup permits the pickup of incoming calls within their own group, while Call Pickup allows users to pick up incoming calls within their own group or any other group.

C.
Call Pickup permits the pickup of incoming calls within their own group, while Group Call Pickup allows users to place a call on hold so it can be retrieved from another phone in the system.

Explanation:
Understanding Call Pickup and Group Call Pickup
CiscoIP phones provide two call pickup types:
1. Call pickup-Allows users to pick up incoming calls within their own group. CiscoCallManager automatically dials the appropriate call pickup group number when a user activates this feature from a CiscoIPphone.
2. Group callpickup-Allows users to pick up incoming calls within their own group or in other groups. Users must dial the appropriate call pickup group number when activating this feature from a CiscoIPphone.
The same procedures apply for configuring both of these features. Group call pickup numbers apply to lines or directory numbers.
http://www.cisco.com/en/US/partner/products/sw/voicesw/ps556/products_administration_guide_chapter09186 a