Which of the Following Are True of Cerebrospinal Fluid

Which of the following are true of cerebrospinal fluid?
1) The total volume of CSF in adults is about 350 mL.
2) The total amount of CSF is replaced every 6 to 8 hours.
3) CSF is produced by the choroid plexus.

A) 1, 2, 3
B) 1, 2
C) 2, 3
D) 1, 3