Which statement is true regarding the location of senile plaques and neurofibrillary tangles in the brain?
a. Senile plaques are inside neurons, and neurofibrillary tangles are outside neurons.
b. Both senile plaques and neurofibrillary tangles are found in the nucleus of neurons.
c. Senile plaques are extracellular, and neurofibrillary tangles are intracellular.
d. Both senile plaques and neurofibrillary tangles are located in the cell membrane of neurons.