What is the proper meaning of the word "cue" in the second paragraph

A．expensive in installing the system
B．efficient in saving employees for meetings
C．worthwhile by not sending employees for meetings
D．useful in changing boring meeting into exiting ones

A．it takes them 4 years to build the dynamic program
B．they spend significant money in installing the equipment
C．the desktop units make them have full control of multipoint needs
D．they have the latest software developed by other companies