What is the keyboard shortcut to deselect?

A company is deploying a new two-tier web application in AWS. The company has limited staff and requires high availability, and the application requires complex queries and table joins. Which configuration provides the solution for the company's requirements?

A. MySQL Installed on two Amazon EC2 Instances in a single Availability Zone B. Amazon RDS for MySQL with Multi-AZ C. Amazon ElastiCache D. Amazon DynamoDB

4. IF Temp > = 100 & Temp < 200 THEN;

Fill in the blank(s) with the appropriate word(s). What is wrong with each of the following lines of code?