In the following equation, which of the two signs will be interchanged to get the correct equation?
119 - 21 ÷ 7 + 117 × 3 = 11

119 - 21 ÷ 7 + 117 × 3 = 11 

​$$\begin{array}{|c|c|} \hline\textbf{Operation preference wise} & \textbf{Symbol} \\\hline\text{Brackets} &[],{}, () \\ \hline \text{Orders, of} & (power), √ (root) , of \\ \hline \text{Division}& ÷ \\ \hline \text{Multiplication} & × \\ \hline \text{Addition} & + \\ \hline \text{Subtraction} & - \\\hline \end{array}$$​​

a) - and +

New Expression: 119 + 21 ÷ 7 - 117 × 3 = 11 

119 + 3 - 117 × 3 = 11 

119 + 3 - 351 = 11 

119 + 3 - 351 = 11 

122 - 351 = 11 

-229 = 11 (Incorrect)

b) - and ×

New Expression: 119 × 21 ÷ 7 + 117 - 3 = 11 

119 × 3 + 117 - 3 = 11 

357 + 117 - 3 = 11 

474 - 3 = 11 

471 = 11 (Incorrect)

c) ÷ and ×

New Expression: 119 - 21 × 7 + 117 ÷ 3 = 11 

119 - 21 × 7 + 39 = 11 

119 - 147 + 39 = 11 

158 - 147 = 11 

11 = 11 (Correct)

Thus, correct option is (c).