AWS Certified Solutions Architect Associate Test 10

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Question : 61 of 70

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A user has configured a website and launched it using the Apache web server on port 80. The user is using ELB with the EC2 instances for Load Balancing. What should the user do to ensure that the EC2 instances accept requests only from ELB?

Configure the security group of EC2, which allows access to the ELB source security group
Configure the EC2 instance so that it only listens on the ELB port
Open the port for an ELB static IP in the EC2 security group
Configure the security group of EC2, which allows access only to the ELB listener

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