Deployment group is the correct option because the team needs to publish to multiple virtual machines that already run the Azure Pipelines agent.

A Deployment group defines a set of target machines for a release pipeline and relies on the Azure Pipelines agent installed on each machine to execute deployment tasks. Deployment groups let you manage and orchestrate releases across many servers whether they are in a colocation facility or in a cloud environment and they are the intended mechanism when you have agent based targets.

Management group is incorrect because management groups are used to organize subscriptions for governance and policy purposes and they do not target or control deployments to individual machines.

Resource group is incorrect because resource groups are an Azure construct for grouping resources within a subscription and they do not provide the release orchestration for machines in an external colocation facility.

Service connection is incorrect because service connections grant pipelines access to external services or subscriptions and they do not group or manage a set of target machines for agent based deployments.

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