103 (2) Whoever commits murder shall, (a) if the murder has been committed after previous planning and involves extreme brutality; or (b) if the murder involves exceptional depravity; or (c) if the murder is of a member of any of the armed forces of the Union or of a member of any police force or of any public servant and was committed (i) while such member or public servant was on duty; (ii) in consequence of anything done or attempted to be done by such member of public servant in the lawful discharge of his duty as such member or public servant whether at the time of murder he was such member or public servant as the case may be, or had ceased to be such member or public servant; or (d) if the murder is of a person who had acted in the lawful discharge of this duty under section 43 of the Code of Criminal Procedure, 1973, or who had rendered assistance to a Magistrate or a police officer demanding his aid or requiring his assistance under section 37 or section 129 of the said Code; or (e) if the murder has been committed by him, while under sentence of imprisonment for life, and such sentence has become final, be punished with death, or imprisonment for life, and shall also be liable to fine.