(d)who has been convicted by a court for an offence involving fraud, shall be qualified to represent an assessee under sub-section (1), for all times in the case of a person referred to in clause (a), for such time as the Principal Chief Commissioner or Chief Commissioner or Principal Commissioner or Commissioner may by order determine in the case of a person referred to in clause (b), for the period during which the insolvency continues in the case of a person referred to in clause (c), and for a period of ten years from the date of conviction in the case of a person referred to in clause (d).]