How do you check prerequisites for the SAP web dispatcher?

You want to enable communication between the SAP web dispatcher and an ABAP-based SAP system .

How do you check prerequisites for the SAP web dispatcher? There are 2 correct answers to this question.
A . Ensure that ICF service /sap/public/icf_info/icr_groups is active
B . Determine the HTTP port of the ABAP message server
C . Determine the HTTP port of the PAS instance’s ICM Process
D . Ensure that ICF service/sap/public/ping is active

Answer: A,B