Allosteric Regulation of PFK-1

During the process of cellular respiration, the metabolism of glucose can be understood more comprehensively by investigating specific pathways involved in ATP production. One of the critical regulatory enzymes that plays a major role in this process is phosphofructokinase-1 (PFK-1). This enzyme is a key control point in glycolysis and is activated by certain metabolite levels. Understanding the role of PFK-1 is crucial in the context of metabolic pathways and their regulation.

Which of the following metabolites is an allosteric activator of phosphofructokinase-1, thus enhancing the glycolytic pathway and promoting ATP production?