Which ICD-10-CM coding example demonstrates the sequencing of diabetes as a secondary manifestation? a) E11.9 (Type 2 diabetes mellit, unspecified) b) E10.9 (Type 1 diabetes mellit, unspecified) c) E11.42 (Type 2 diabetes mellit with diabetic polyneuropathy) d) E10.621 (Type 1 diabetes mellit with foot ulcer)