Koch's Sign,Collarette Bridge or Indentation of the Collarette ?

You may identify this iris sign as - (a) Collarette Rope/ Koch's Sign, Collarette Bridge or a local indentation of the collarette ( a + b) directed towards to the inner pupillary border? The collarette " rope" represented with red dotted line and the rope is approaching to the edge of the IPB but does not joining the edge of the collarette forcing to the inner pupillary border...I would suggest is a Collarette Rope ! it might not classify as bridge ! Would it be just a normal iris fibre at the inner pupillary zone ?