A simple mechanism for enzyme-catalyzed reaction is given by the following set of equations

 E                  +              S                ⇌                      ES

(enzyme)                   (reactant)                       (intermediate-1)

ES              ⇌                              EP

(intermediate-1)                  (intermediate-2)                        

EP               ⇌                   E            +          P

(intermediate-2)            (enzyme)           (product)

This is known as the Michaelis–Menten mechanism. The potential energy diagram is shown in the fig. Which of the following sets of identifications is correct ? (Assume that the temperature and pressure are constant).