Which two signs are to be interchanged to make the equation below true? \[\text{5 }\!\!\times\!\!\text{ 15 }\div \text{ 7 - 20 + 4 = 77}\]

• A.  \[-\]and \[\div \]            
• B.         \[\times \]and \[\div \]
• C.  \[\text{+}\] and \[\div \]              
• D.         \[\text{+}\] and \[\times \]