Exercise 3: Write an EBNF description for the C switch statement The following is an example switch statement: switch (a+b) { case 1: x = 7; break; case 2: x=8; break; default : x=9; } where a+b is an expression, 1 and 2 are literals, and "x=7;break;", "x=8;break;" and "x=9;" are statement lists. Assume non- terminals , , and are given. -> switch (* )"{{case : } [default : ]