Which statement about agent-based versus agentless configuration management tools is true?

Which statement about agent-based versus agentless configuration management tools is true?
A . Agentless tools require no messaging systems between master and slaves.
B . Agentless tools use proxy nodes to interface with slave nodes.
C . Agent-based tools do not require a high-level language interpreter such as Python or Ruby on slave nodes.
D . Agent-based tools do not require installation of additional software packages on the slave nodes.

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Answer: A