A 50-year-old male presented with signs and symptoms of restrictive heart disease. A right ventricular endo-myocardial biopsy revealed deposition of extracellular eosinophilic hyaline material. On transmission electron microscopy, this material is most likely to reveal the presence of-
Non branching filaments of indefinitive length Cross banded fibres with 67 m periodicity Weber Palade bodies Concentric whorls of lamellar structures