All IBLc orders will be booked through
A
Correct answer
Explanation
IBLc orders are booked through CLICK, which appears to be a specific order management or workflow system used for IBLc (Integrated Business Line - commercial perhaps) services. The other options (MPA, Advantex, OE) are likely other systems but not the correct one for IBLc order booking. This is testing knowledge of specific telecom workflow systems.