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

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

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

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

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

e$.$ 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.