A Certified Protection Officer (CPO) observes an individual physically assaulting another person on the private property they are assigned to protect. According to the principle of citizen's arrest, which of the following conditions is MOST critical for the CPO's authority to detain the aggressor?
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A
The CPO must have personally witnessed the commission of the offense.
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B
The CPO must first issue a verbal warning to the aggressor.
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C
The CPO must be an armed officer with specific arrest powers.
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D
The CPO must have probable cause that a misdemeanor was committed.