Zhang San: Only formal party members can raise their hands to vote. Li Si: No! Sun Feng is also a formal party member but he did not raise his hands to vote. Li Si's answer was to misunderstand Zhang San's words as to which of the following? ['All those who raise their hands to vote are full party members.', 'Sun Feng will raise his hand to vote.', 'All formal party members raised their hands to vote.', 'No formal party members raised their hands to vote.']