Explanation:

Box 1: No
SAP HANA Replication consists of one primary node and at least one secondary node. Changes to the data on the primary node are replicated to the secondary node synchronously or asynchronously.
Box 2: No
Since SPS11 SAP HANA system replication can be run in two different operation modes:
delta_datashipping
logreplay
Box 3: Yes
Reference:
https://docs.microsoft.com/en-us/azure/virtual-machines/workloads/sap/sap-hana-high-availability-rhel
https://blogs.sap.com/2018/01/08/your-sap-on-azure-part-4-high-availability-for-sap-hana-using-system-replicati