Which of the following statements is false?

a. an inconclusive finding by a document examiner may be due to an insufficient number of known writings available for comparison
b. any object that contains handwritten or typewritten markings whose source or authenticity is in doubt is a questioned document
c. once adulthood is reached, an individual's handwriting generally will not change with age
d. in the case of gilbert v. california, the court held that the taking of handwriting exemplars was not prohibited by the fifth amendment
e. all of the above statements are true