Hydrocephalus

Which of the following statements best describes the flow of cerebrospinal fluid within the ventricular system?

1: CSF flows from the lateral ventricles directly into the subarachnoid space.
2: CSF flows from the subarachnoid space to the systemic circulation via the foramen of Luschka.
3: CSF is produced by arachnoid granulations in the lateral ventricles and flows through the interventricular foramen to the third ventricle.
4: CSF is produced by the choroid plexus and flows from the fourth ventricle through the median and lateral apertures (i.e., the foramen of Magendie and the foramina of Luschka) to the subarachnoid space.