Consider the following statements with regards to the shear force diagram for the beam ABCD:
 

1) The beam ABCD is an overhanging beam having supports at A and D only.
2) The beam carries a point load of 20 kN at C
3) The beam carries a concentrated load of 10 kN at the end B
4) The beam is an overhanging beam having supports at C and D only.
5) The beam carries a uniformly distributed load of 70 kN over the left hand portion AC only.
Which of the above statements are correct?