What is a characteristic of the delta data shipping operation mode in SAP HANA system replication?

What is a characteristic of the delta data shipping operation mode in SAP HANA system replication?
A . It takes place in addition to continuous log replay.
B. It takes place in addition to continuous log shipping
C. It takes place every 5 minutes
D. It takes place with continuous read-only access to the secondary system

Answer: B