If a system undergoes an isothermal reversible change, the mechanical work involved in the system during transformation can be represented by

(a) \(\Delta A_{T}=W_{\max }\)

(c) \(\Delta A_{T}=-W_{\max }\)

(b) \(-\Delta A_{T}=W_{\max }\)

(d) \(-\Delta A_{T}=W_{\min }\).