Which are correct:<br/><br/><span style="color:#ff0000;">1-We were both going up the stairs. <u>I was below him</u>.</span><br/><br/><span style="color:#800080;">2-We were both going up the stairs. <u>I was lower than him</u>.</span><br/><br/><span style="color:#0000ff;">3-We were both going up the stairs. <u>I was at a lower level than him</u>.</span><br/><br/><span style="color:#000080;">4-We were both going up the stairs. <u>I was further down than him</u>.</span>