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The correct answer is AB * CD * +. The Reverse Polish Notation (RPN) is also referred to as a postfix notation where the operands are followed by the operators.

In this notation, operator is prefixed to operands, i.e. operator is written ahead of operands. For example, +ab. This is equivalent to its infix notation a + b. Prefix notation is also known as Polish Notation.

Reverse Polish notation (RPN) is a method for representing expressions in which the operator symbol is placed after the arguments being operated on. Polish notation, in which the operator comes before the operands, was invented in the 1920s by the Polish mathematician Jan Lucasiewicz.

Polish Notation in the data structure is a method of expressing mathematical, logical, and algebraic equations universally. This notation is used by the compiler to evaluate mathematical equations based on their order of operations.

Polish notation was invented in 1924 by Jan Lukasiewicz, a Polish logician and philosopher, in order to simplify sentential logic. The idea is simply to have a parenthesis-free notation that makes each equation shorter and easier to parse in terms of defining the evaluation priority of the operators.

In reverse Polish notation, the operators follow their operands. For example, to add 3 and 4 together, the expression is 3 4 + rather than 3 + 4. The expression 3 ? 4 + 5 in conventional notation is 3 4 ? 5 + in reverse Polish notation: 4 is first subtracted from 3, then 5 is added to it.

Prefix notation is also known as polish notation. In this notation, the operators are written before the operands, not like the infix in which the operators are in-between the operands. For example, the infix notation (5+6)*7 will be written as *+567 in prefix notation.

Polish notation Lower case letters are used as sentence letters. The capital letter N is used for negation. A is used for disjunction, K for conjunction, C for the conditional, E for the biconditional. ('A' is for alternation, another name for logical disjunction.