How can the user add these instances with Auto Scaling?

A sys admin is maintaining an application on AWS. The application is installed on EC2 and user has configured
ELB and Auto Scaling. Considering future load increase, the user is planning to launch new servers proactively
so that they get registered with ELB. How can the user add these instances with Auto Scaling?

A.
Increase the desired capacity of the Auto Scaling group

B.
Increase the maximum limit of the Auto Scaling group

C.
Launch an instance manually and register it with ELB on the fly

D.
Decrease the minimum limit of the Auto Scaling grou

Explanation:
A user can increase the desired capacity of the Auto Scaling group and Auto Scaling will launch a new instance
as per the new capacity. The newly launched instances will be registered with ELB if Auto Scaling group is
configured with ELB. If the user decreases the minimum size the instances will be removed from Auto Scaling.
Increasing the maximum size will not add instances but only set the maximum instance cap.