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(c) (1) The department shall promptly examine each claim for waiting week

credit and each claim for compensation and on the basis of the facts

found by it shall determine whether or not the claim is valid.

(2) Notice of such determination need not be given to the claimant if the

claim is determined valid, but if the claim is determined invalid,

notice shall be given by the department in writing to the claimant

stating that the claim is invalid and the reason therefor.

(3) Notice of such determination need not be given to any base-year

employer or last employer of the claimant unless such base-year

employer or last employer has filed with the department information

in writing which might raise a question as to the eligibility of the

claimant for any reason other than his failure to comply with the

provisions of section four hundred one (a), in which event notice

shall be given as provided herein.

(4) If an employer files with the department such information no later

than twenty-one days after the "Determination Date" provided on

the notice required under section five hundred one (a) or the "Notice

Date" provided on the notice required under section five hundred one

(b), the department shall issue to such employer