Obligations of directors and managers
(a)
a person who has been a director or manager shall not be liable to make such further contribution, if he has ceased to hold office for a year or upwards before the commencement of the winding up;
(b)
a person who has been a director or manager shall not be liable to make such further contribution in respect of any debt or liability of the company contracted after he ceased to hold office;
(c)