What is the test for an aider and abettor to be found liable for assisting and abetting the commission of a crime?

"Except for strict liability offenses, every crime has two components: (1) an act or omission, sometimes called the actus reus; and (2) a necessary mental state, sometimes called the mens rea. [Citations.] This principle applies to aiding and abetting liability as well as direct liability. An aider and abettor must do something and have a certain mental state." (People v. McCoy (2001) 25 Cal.4th 1111, 1117 (McCoy).) "A person aids and abets the commission of a crime when he or she, (i) with knowledge of the unlawful purpose of the perpetrator, (ii) and with the intent or purpose of committing, facilitating or encouraging commission of the crime, (iii) by act or advice, aids, promotes, encourages or instigates the commission of the crime. [Citation.]" (People v. Cooper (1991) 53 Cal.3d 1158, 1164.) "The mental state necessary for conviction as an aider and abettor, however, is different from the mental state necessary for conviction as the actual perpetrator. [] The actual perpetrator must have whatever mental state is required for each crime charged .... An aider and abettor, on the other hand, must 'act with knowledge of the criminal purpose of the perpetrator and with an intent or purpose either of committing, or of encouraging or facilitating commission of, the offense.' [Citation.] The jury must find 'the intent to encourage and bring about conduct that is criminal, not

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