4. Reasons for a decision declaring inadmissible an application for authorisation for the purpose of seasonal work or rejecting an application for authorisation for the purpose of seasonal work or refusing an extension of stay or renewal of the authorisation for the purpose of seasonal work shall be given in writing to the applicant. Reasons for a decision withdrawing the authorisation for the purpose of seasonal work shall be given in writing to both the seasonal worker and, if provided for in national law, the employer.