Select the cloud security threats that this cloud security mechanisms is primarily used to counter. Cloud Security Mechanism:
1. Encryption
2. Digital Signatures
3. Identity and Access Management
4. Single Sign-On
5. Cloud-Based Security Groups Boundary
6. Hardened Virtual Server Image

Cloud Security Threats:

a. Malicious Intermediary
b. Denial of Service
c. Insufficient Authorization
d. Virtualization Attack
e. Overlapping Trust