What is the horizontal distance between support C and the centre of mass of the machine at the exact instant the beam begins to tip?
2.75 m2.75\text{ m}2.75 m
3.00 m3.00\text{ m}3.00 m
3.25 m3.25\text{ m}3.25 m
3.50 m3.50\text{ m}3.50 m