c
(c)\(\frac{{{I_{\max }}}}{{{I_{\min }}}} = {\left( {\frac{{\sqrt {\frac{{{I_1}}}{{{I_2}}}} + 1}}{{\sqrt {\frac{{{I_1}}}{{{I_2}}}} - 1}}} \right)^2} = {\left( {\frac{{\sqrt {\frac{{25}}{4}} + 1}}{{\sqrt {\frac{{25}}{4}} - 1}}} \right)^2} = \frac{{49}}{9}\)