True or false. No explanations are necessary. (a) An interpreter and a compiler have many front-end phases in common. (b) A program with valid syntax always have valid semantics. (c) In general, compiler cannot perform value-based analysis. (d) It is not possible to define a pure function in an imperative language. (e) Array and function are two examples of type constructors. (f) Type-checking always happens at compile time. (g) Not all functional languages are pure. (h) Higher-order functions and first-class functions imply each other