6.    :<br><br>a = new String(" ");<br>trace("a = " + a);<br>a.x = 4; <br>trace("a.x = " + (a.x == undefined ? "undefined" : a.x));<br> <br>trace("(a instanceof String) = " + (a instanceof String));<br>trace("");<br>b = " ";<br>trace("b = " + b);<br>b.x = 4; <br>trace("b.x = " + (b.x == undefined ? "undefined" : b.x));<br>trace("(b instanceof String) = " + (b instanceof String));
A) a =  <br>a.x = 4<br>(a instanceof String) = true<br><br>b =  <br>b.x = undefined<br>(b instanceof String) = false*10
B) x =  <br>a.x = 4<br>(a instanceof String) = true<br><br>b =  <br>b.x = undefined<br>(b instanceof String) = false*0
C) a =  <br>a.x = 4<br>(a instanceof String) = true<br><br>b =  <br>b.x = undefined<br>(b instanceof String) = true*0
D) a =  <br>a.x = 4<br>(a instanceof String) = false<br><br>b =  <br>b.x = undefined<br>(b instanceof String) = false*0
E) a =  <br>a.x = 4<br>(a instanceof String) = false<br><br>b =  <br>b.x = undefined<br>(b instanceof String) = true*0
