Which statement about the pros and cons of various cloud computing approaches is accurate?

Question $23$ options:

a$)$

Hybrid cloud computing provides flexibility, scalability, and cost efficiency with low security risks.

b$)$

Deep technical skills and sophisticated software are needed to begin using public cloud computing services.

c$)$

Public and private clouds are very dissimilar in their operation and benefits.

d$)$

Virtual private clouds can provide SaaS but not IaaS service types more efficiently than public clouds.