which two tasks are performed by VMkernel?

When using a hardware iSCSI initiator with an ESXi host, which two tasks are performed by VMkernel? (Choose two.)

A.
Encapsulation of iSCSI PDUs into TCP/IP packets

B.
Mapping requests for blocks on the virtual disk to blocks on the appropriate physical device

C.
Issuing SCSI commands to the virtual disk

D.
Encapsulation of I/O requests into iSCSI Protocol Data Units (PDUs)