A, actuated by malice and with the use of a fully automatic M-14 sub-machine gun, shot a group of persons who were seated in a cockpit with one burst of successive, continuous, automatic fire. Four (4) persons were killed thereby, each having been hit by different bullets coming from the sub-machine gun of A. Four (4) cases of murder were filed against A. The trial court ruled that there was only one crime committed by A for the reason that, since A performed only one act, he having pressed the trigger of his gun only once, the crime committed was murder. Consequently, the trial judge sentenced A to just one penalty of reclusion perpetua.

(a) Was the decision of the trial judge correct? Explain.
(b) What constitutes a complex crime? How many crimes may be involved in a complex crime? What is the penalty therefor? (1999 BAR)