Detailed Answer
(b) In general, the best way to perfect a security interest
in a negotiable instrument is to take possession of the instrument.
This is true because negotiable instruments are easily negotiated
to other holders who can become holders in due course. Answer
(a) is incorrect because a holder can become a holder in due
course even if a security agreement is filed. Answer (c) is incorrect
because perfecting by attachment requires a purchase money
security interest in consumer goods. Answer (d) is incorrect
because this cannot even accomplish perfection until it is filed.