Multiple choice

Assume that the operators +, -, x are left associative and $\land$ is right associative .The order of precedence (from highest to lowest) is $\land$, x, +, -. The postfix expression corresponding to the infix expression a + b x c - d $\land$ e $\land$ f is

  1. abc x +def $\land$$\land$−
  2. abc x + de$\land$f$\land$
  3. ab +c x d−e$\land$f$\land$
  4. −+ a x bc$\land$$\land$def
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