VPC and Subnet details for deployment in existing VPC

Below table states the details of VPC and subnet for deploying in existing VPC:

Table: VPC and Subnet details for deployment

Parameters	Description
VPC ID	Specify the ID of the VPC in your account where the NetBackup server is to be deployed.
Subnet ID	Select the subnet that is within the selected VPC, where the NetBackup server should be deployed.
VPC CIDR Block	Specify the CIDR block contained in the selected VPC. This information is used to create security group rules for the NetBackup server.
Create New DHCP Option Set for this VPC?	Select True only if you want the deployment to create a new DHCP Option set for your VPC. Select False if you already have a DHCP Option set associated with your VPC that can resolve Route 53 host names using an Amazon provided DNS server. Selecting True will override any existing DHCP options associated with the VPC.
NetBackup server Domain Name	Route53 DNS is configured with this domain name and a Record is updated in the corresponding Hosted Zone with the private IP of the NetBackup server.
Is there an Existing Hosted Zone for this Domain?	Select True if a Route53 Hosted Zone associated with the selected VPC already exists for the domain name entered above. Select False to create a new Hosted Zone along with the deployment.