——I’ll meet you outside the school in half an hour,OK?

——I’ll meet you outside the school in half an hour,OK?
—— ( )
1.No,one hour later 2.Yes,that’s fine 3.OK,but I can manage 4.No,I don’t think so
原因写详细点（有什么语法或词组之类的）,劳驾各位了.我还有很多问题没人答,麻烦高手也去看看,