* C. SAP ABAP Connection: This is what you need to use to combine data from a non-sap system and an InfoCube of your SAP BW powered by SAP HANA system using SAP Data Warehouse Cloud. You can use an SAP ABAP connection to connect to your SAP BW system and access the InfoCube data as a remote table. You can then join this remote table with the data from the non-sap system that you have already loaded into SAP Data Warehouse Cloud using a graphical view12.
Reference:
* 1 https://help.sap.com/doc/00f68c2e08b941f081002fd3691d86a7/release/en-US/0c9d6f0a6c4a4b8e8b3f7e5c0a3d6f9d.html
* 2 https://help.sap.com/doc/00f68c2e08b941f081002fd3691d86a7/release/en-US/5c9a6c8b6c4a4b8e8b3f7e5c0a3d6f9d.html

The delta merge process is used to transfer data modifications from the delta storage to the main storage in SAP HANA database. It can be initiated in SAP BW/4HANA in the following ways:
* By using a specific process type in a process chain, called Trigger for DB Merge. This process type can be added to a process chain and linked to the loading processes that require a delta merge. The process type allows specifying the object type and name for the delta merge.
* By using the SAP BW/4HANA data load monitor, which is a web-based tool for monitoring and managing data loads. The data load monitor has an option to trigger a database merge for an object after a successful data load.