Assume that the operators +,-, X are left associative and ^ is right associative. The order of precedence (from highest to lowest) is ^, X, +, -. The postfix expression for the infix expression a + b X c – d ^ e ^ f is?

• A. abc X+ def ^^ –
• B. abc X+ de^f^ –
• C. ab+c Xd – e ^f^
• D. -+aXbc^ ^def