Consider the following formulas with all the symbols having their usual meanings:(a) \({P_t} = {P_c}\left( {1 + \frac{m}{2}} \right)\)(b) \({I_t} = {I_c}{\left( {1 + \frac{{{m^2}}}{2}} \right)^{\frac{1}{2}}}\)(c) \({P_t} = {P_c}\left( {1 + \frac{{{m^2}}}{2}} \right)\)(d) \({I_t} = {I_c}{\left( {1 + \frac{m}{2}} \right)^{\frac{1}{2}}}\)Which of the above are incorrect?

• A. (a) and (b)
• B. (b) and (c)
• C. (c) and (d)
• D. (a) and (d)