A company is running an on-premises application comprised of a web tier, an application tier, and a MySQL database tier. The database is used primarily during business hours with random activity peaks throughout the day. A database specialist needs to improve the availability and reduce the cost of the MySQL database tier as part of the company's migration to AWS.
Which MySQL database option would meet these requirements?

A. Amazon RDS for MySQL with Multi-AZ
B. Amazon Aurora Serverless MySQL cluster
C. Amazon Aurora MySQL cluster
D. Amazon RDS for MySQL with read replica