Which of the following statement$($s$)$ is $($are$)$ correct?

In cloud computing, used resources are measured, and users are charged accordingly.

Clouds are not affected by infrastructure failures in the data centres.

The minimal requirement of encryption for protecting full system backups for clouds is $128-$bit$-$key AES.

The isolation of tenant data in clouds should only be done by software.

Edge computing is suitable for applications that require ultra$-$low latency.

a$.1,3$ and $5$

b$.1,4$ and $5$

c$.3$

d$.2,3$ and $4$

e$.1,3$ and $4$