Which type of optics module is supported by a 6-port 40 GE Cisco Nexus 7000 M2 Series I/O module?

Which type of optics module is supported by a 6-port 40 GE Cisco Nexus 7000 M2 Series I/O module?
A. CPAK
B. QSFP+
C. SFP/SFP+
D. CFP