1: What are the "engine" options for ElastiCache?
Redis & Memcached are the two engine options for ElastiCache

3: The Availability Zone that your RDS database instance is located in is suffering from outages, and you have lost access to the database. What could you have done to prevent losing access to your database (in the event of this type of failure) without any downtime?

4: True or False: A read replica can be promoted to the primary instance.

True

6: True or False: You have to make your own backups of RDS databases, AWS does not automate the process

7: Which is NOT an attribute of DynamoDB?

8: True or False: When setting up a DynamoDB database, you need to select the instance size and storage type.

9: What database service should you choose if you need petabyte-scale data warehousing?

Redshift is for petabyte-scale data warehousing.