Question 10 (Mandatory) (1 point) The height, h, in centimetres, of a piston moving up and down in an engine cylinder can be modelled by the function h(t) = 18 sin(50x/) + 18, where t is the time, in seconds. What is the piston's minimum height? O a) -18 cm O b) 9 cm O c) 18 cm d) o cm