What is the benefit of using AWS managed services, such as Amazon ElastiCache and Amazon Relational Database Service (Amazon RDS)?

What is the benefit of using AWS managed services, such as Amazon ElastiCache and Amazon Relational Database Service (Amazon RDS)?
A . They require the customer to monitor and replace failing instances.
B . They have better performance than customer-managed services.
C . They simplify patching and updating underlying OSs.
D . They do not require the customer to optimize instance type or size selections.

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Answer: C