Recall the main function in interpreter.js:

1.  function evalExp(exp,envir) {
2.     if (SLang.absyn.isIntExp(exp)) {
3.         return SLang.env.createNum(SLang.absyn.getIntExpValue(exp));
4.     } else if (SLang.absyn.isVarExp(exp)) {
5.         return SLang.env.lookup(envir,SLang.absyn.getVarExpId(exp));
6.     } else if (SLang.absyn.isFnExp(exp)) {
7.         return SLang.env.createClo(
                            SLang.absyn.getFnExpParams(exp),
                            SLang.absyn.getFnExpBody(exp),
                            envir);
8.     } else if (SLang.absyn.isAppExp(exp)) {
9.         var f = evalExp(SLang.absyn.getAppExpFn(exp),envir);
10.        var args = SLang.absyn.getAppExpArgs(exp).map( 
                        function(arg) { return evalExp(arg,envir); } );
11.        if (SLang.env.isClo(f)) {
12.            return evalExp(SLang.env.getCloBody(f),
                           SLang.env.update(
                                 SLang.env.getCloEnv(f),
                                 SLang.env.getCloParams(f),args));
13.        } else {
14.            throw new Error( f +
                    " is not a closure and thus cannot be applied.");
15.        }
16.     } else if (SLang.absyn.isPrimAppExp(exp)) {
17.         return applyPrimitive(SLang.absyn.getPrimAppExpPrim(exp),
                              SLang.absyn.getPrimAppExpArgs(exp)
                                 .map( function(arg) { 
                                       return evalExp(arg,envir); } ));
18.    } else {
19.        throw "Error: Attempting to evaluate an invalid expression";
20.    }
21. }

Note that, when a statement above takes up more than one line, only its first line is numbered. Among the options listed below, which one is the largest set of lines that get executed when the following SLang 1 program is interpreted?

          (fn (u,v) => fn (f) => 3 x +(x,y)) 

• Line 12
• Lines 7, 12
• Lines 3, 7, 12
• Lines 3, 5, 7, 12
• Lines 3, 5, 7, 17
• Lines 3, 5, 7, 12, 17