Please complete 1A, 1B, 1C. Will rate positively if all complete/correct.

1A. What is the language described by the following grammar? How many sentences does the language contain? II letters Hints (1) Consider the following leftmost derivation, -* ab, ab is a sentence of the grammar and , , a, and ab are all sentential forms of the grammar (2) The rightmost derivation is b ab => => => 1B. Write BNF to define the syntax for the language used to assign an result to 1 or more s implied by the following examples. LET x = 1+2; LET Xe.x = x/2; :: 1C. Complete the derivation started below of the sentence x+1 *x*-2+3. IREl2 3 1D (Continuing 1B) Draw the corresponding parse tree