B. Allen acquired an instrument from C. Baker for value. The instrument was indorsed in the form Pay to B. Allen or order, C. Baker. The instrument, which was executed by D. Carlton, stated: I, D. Carlton, promise to pay to C. Baker $5,000 on March 10, 2019. When Carlton refused to make timely payment on the note to Allen, Allen sued Carlton. Carlton asserted certain defenses which could not successfully be used if Allen was a holder in due course. Was Allen a holder in due course? Discuss.