4. All except occurs on Decrease in liver glucose level :

            a.inhibition of PFK2

            b.Activation of Fructose 2,6bisphosphatase

             c.increase in glucagon

             d.increase in Fructose2,6bis phosphate

When there is an abundant supply of glucose, the concentration of fructose 2,6-bisphosphate increases, stimulating glycolysis by activating phosphofructokinase-1 and inhibiting fructose 1,6-bisphosphatase. In the fasting state, glucagon stimulates the production of cAMP, activating cAMP-dependent protein kinase, which in turn inactivates phosphofructokinase-2 and activates fructose 2,6-bisphosphatase by phosphorylation. Hence, gluconeogenesis is stimulated by a decrease in the concentration of fructose 2,6-bisphosphate, which inactivates phosphofructokinase-1 and relieves the inhibition of fructose 1,6-bisphosphatase.[Harper 28^th edition]

 Answer is increase in Fructose2,6bis phosphate