In the $\_\_\_\_\_\_$ cloud scenarios, enterprises cannot implement network security controls such as host$-$based firewalls, intrusion detection$/$prevention$,$ and packet capture and signature detection $($particularly in support of investigations$),$ whereas, in the $\_\_\_\_\_\_\_\_$cloud scenarios, customers have full control over the system at the operating system level and above, and have the ability to monitor, scan, and patch the systems.

a$.$

PAAS,IAAS

b$.$

PAAS,SAAS

c$.$

SAAS, IAAS

d$.$

SAAS, PAAS