(a) A filed record is effective only to the extent that it was filed by a person that may file it under section 9-509 or by the filing office under section 9-513A.

(b) A record authorized by one secured party of record does not affect the financing statement with respect to another secured party of record.

(c) A continuation statement that is not filed within the six-month period prescribed by section 9-515(d) is ineffective.