Counterclaim: Refers to an action in which an accused has filed an independent action in an action that has been linked to the original suit. According to the above definitions, Which of the following actions are counterclaims:. ['Teacher sues student against borrowing money, student sues teacher for plagiarism.', 'Plaintiff sues for divorce, and the defendant asks the court to confirm marriage.', 'The plaintiff sued, asking the defendant to deliver according to the sales contract, and the defendant sued the supplier for failing to trade on time.', 'The plaintiff sued the defendant for the ownership of the house he lived in, and the defendant asked the court to let the plaintiff repay the arrears.']