A copper wire upon loading instantaneously increases in length to $l$, and then continues to elongate gradually. Upon unloading, the wire retracts to length $l$. According to the Maxwell model, which one of the options given correctly relates the total strain $E$, the applied stress $S$, the modulus $G$, the material’s resistance to flow $\eta$, and the elapsed time $t$ between loading and unloading?