You are installing a database server on an EC$2$ instance. You will use the database server to load data and do data analysis one week per month, so you want to stop the instance when it is not in use to save funds. Where do you install the operating system and database? On an instance store. On the Amazon Simple Storage Service $($S$3).$ On the Amazon Elastic Load Balancing $($ELB$).$ On the Amazon Elastic Block Store $($EBS$).$