<prompt>  A one year old boy presented with hepatosplenomegaly and delayed milestones. The liver biopsy and bone marrow biopsy revealed presence of histiocytes with PAS-positive Diastase-resistant material in the cytoplasm. Electron-microscopic examination of these histiocytes is most likely to reveal the presence of-Birbeck granules in the cytoplasmMyelin figures in the cytoplasmParallel rays of tubular structures in lysosomesElectron dense deposit in the mitochondria 