For the purposes of this Chapter,—(A) an employee shall be said to be in continuous service for a period if he has, for that period, been in uninterrupted service, including service which may be interrupted on account of sickness, accident, leave, absence from duty without leave (not being absence in respect of which an order treating the absence as break in service has been passed in accordance with the standing orders, rules or regulations governing the employees of the establishment), lay-off, strike or a lock-out or cessation of work not due to any fault of the employee, whether such uninterrupted or interrupted service was rendered before or after the commencement of this Code;

(B) where an employee (not being an employee employed in a seasonal establishment) is not in continuous service within the meaning of clause (A), for any period of one year or six months, he shall be deemed to be in continuous service under the employer—

Explanation.—For the purposes of this clause, the number of days on which an employee has actually worked under an employer shall include the days on which—

(C) where an employee, employed in a seasonal establishment, is not in continuous service within the meaning of clause (A), for any period of one year or six months, he shall be deemed to be in continuous service under the employer for such period if he has actually worked for not less than seventy-five per cent. of the number of days on which the establishment was in operation during such period.