Need your Help (URGENT)

A company is moving most of its customer-facing production systems to the cloud-facing production systems to the cloud. IaaS is the service model being used. The Chief Executive Officer is concerned about the type of encryption available and requires the solution must have the highest level of security.

Which of the following encryption methods should the cloud security engineer select during the implementation phase?

Options: A Instance-based
B Storage-based
C Proxy-based
D Array controller-based

someone is saying Option A and other is saying Option D 

 

A small company needs to reduce its operating costs. vendors have proposed solutions, which all focus on management of the company's website and services. The Chief information Security Officer (CISO) insist all available resources in the proposal must be dedicated, but managing a private cloud is not an option. Which of the following is the BEST solution for this company?

Options: 

A Community cloud service model
B Multinency SaaS
C Single-tenancy SaaS
D On-premises cloud service model

someone is saying option A is correct answer and other is saying option B 

Please guide 

A Chief Information Officer is considering migrating all company data to the cloud to save money on expensive SAN storage.

Which of the following is a security concern that will MOST likely need to be addressed during migration?

Options:

A Latency
B Data exposure
C Data loss
D Data dispersion    

NOTE : someone is saying C and other is saying A ........Please help to share the answer with the justification .,

Which of the following allows computation and analysis of data within a ciphertext without knowledge of the plaintext?

Options:

A Lattice-based cryptography
B Quantum computing
C Asymmetric cryptography
D Homomorphic encryption   Note : someone is saying answer is answer C and other is saying D i am confused ... please help to guide the same