Which of the following is $[$NOT$]$ true about cloud computing?

a$.$

It eliminates the concern about data and systems security for firms since cloud providers offer a layer of security protection for their customers.

b$.$

It can increase capacity when more computing resources are needed, especially to meet an unexpected surge in demand.

c$.$

It is possible for a firm to let its work run on their internal systems while they move capacity to the could.

d$.$

Scalability is related to costs because if a firm were to purchase in$-$house computing resources to accommodate excessive demand, these rerosources become idle most of time.

e$.$

Few firms have in$-$house employees who match the knowledge and procedures of cloud leaders.