If the defendant chooses to file an answer within the time permitted, the answer must address each of the plaintiffs' allegations by admitting the allegation, denying it, or pleading a lack of sufficient information to admit or deny the allegation.
The answer must address each of the plaintiffs' allegations by. The answer is admitting the allegation. The answer is denying it. The answer is pleading a lack of sufficient information. This is to admit or deny the allegation. The defendant chooses to file an answer within the time. This time is permitted.