CD¯¯¯¯¯¯¯¯ is a perpendicular bisector of AB¯¯¯¯¯¯¯¯, where D is on AB¯¯¯¯¯¯¯¯. Which of the following is true according to the definition of a perpendicular bisector? 1) AD=CD=BD and m∠ACD+m∠DCB=90°

2) AD=BD and m∠ACD+m∠DCB=90°

3) AD=BD and m∠ADC=m∠BDC=90°

4) AD=CD=BD and m∠ADC=m∠BDC=90°