The following are statements about Botnet.

Mirai Botnets exploit loT devices.

The Botnet herder $($or Botmaster$)$ can control Botnet using command and control software.

The most effective way to remove Botnet is to clean up infected PCs individually.

Conficker Botnet generated a large number of domain names every day.

Which is $($are$)$ incorrect statement$($s$)?$

a$.3$

b$.2$ and $4$

c$.1$ and $4$

d$.1$ and $3$

e$.$ None of the above