According to Vietnamese 2005 Civil Code, to be effective, a civil transaction must ( ).a. Be created by the persons having full civil act capacityb. Have the purposes and contents which do not violate prohibitory provisions of law and are not contrary to social ethics.c. Be created voluntarily by the persons participating in the civil transactiond. All of the choices: "Be created by the persons having full civil act capacity; "Have the purposes and contents which do not violate prohibitory provisions of law and are not contrary to social ethics"; and "be created voluntarily by the persons participating in the civil transaction"

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