If, during the probation period of a member of the Central Industrial Security Force, the appointing authority is of the opinion that the member is not fit for permanent appointment, which one of the following actions cannot be taken by the appointing authority ?

According to Rule 26 of the Central Industrial Security Force (CISF) Rules, 2001, if the appointing authority finds a member on probation unfit for permanent appointment, they may take specific actions. These include terminating the member's services after giving one month's notice or by paying one month's pay and allowances in lieu of such notice. The rules also permit reverting the member to the rank from which they were promoted or repatriating them to their parent department.

Option B is the correct answer because the rules specify a period of one month's pay, not three months' pay. Therefore, the appointing authority does not have the power to terminate services by giving three months' pay in lieu of notice under these specific probation rules.