The dragmacidin class of natural products has been isolated from various marine sponges. They have been shown to have many interesting biological properties, including anti-viral, anti-fungal, and anti-bacterial D, shown below, was also made in the laboratory, which allowed the structure to be confirmed. The positive charge in dragmacidin D is delocalized. Draw all four resonance structures that show delocalization of this change. Do not draw resonance and curved arrows. Include formal charges and lone pairs in your answer.