You Receive a Filled Purple-Top (EDTA-Containing)tube with a Request for a Cyanide

You receive a filled purple-top (EDTA-containing) tube with a request for a cyanide assay that requires a whole blood sample.You:

A) realize that the tube you received will not yield any red blood cells,so you call to request a new sample collection.
B) realize that the tube you received will give you serum when separated,so you call to request a new sample collection.
C) know that the tube you received is perfectly fine if well mixed and proceed to run the sample to check for evidence of cyanide.
D) know that urine is the only specimen you can use for this type of assay,so you call to have a new sample collected.