The definitive diagnosis of eosinophilic meningitis caused by Angiostrongylus cantonensis can be accomplished through ____.

(a) Detection of specific antibodies by enzyme immuno assay (EIA)
(b) Detection of A. cantonensis DNA in tissue sections by polymerase chain reaction (PCR)
(c) Identification of A. cantonensis eggs in stool samples using bright-field microscopy
(d) Identification of the worm in tissue sections from the eye, brain, or CSF