What do you need to do if you want MRP live to create planned orders for externally procured materials?

What do you need to do if you want MRP live to create planned orders for externally procured materials?
A . Implement BAdi PPH_MRP_SOURCING_ BADI => SOS_DET_ADJUST
B . Set the appropriate plat specific material status
C . Set the MRP indicator in the source list of the material to ‘ Not relevant for planning"
D . Change the procurement type of the material

Answer: A