Which of the following statement(s) is/are incorrect regarding the point charge?
Options:
(a) The charge `q` on a body is always given by `q=ne`, where `n` is any integer, positive or negative.
(b) By convention, the charge on an electron is taken to be negative.
(c) The fact that electric charge is always an integral multiple of e is termed as quantisation of charge.
(d) The quantisation of charge was experimentally demonstrated by Newton in 1912.