For each pair of specifications below, state whether the extending class is a true subtype of its superclass or not. Explain why you chose the answer that you did.

1. class Triangle { // modifies: this // effects: this_post.a=a, this_post.b=b, this_post.c=c void setSides(int a, int b, int c); } class IsoscelesTriangle extends Triangle { // modifies: this // effects: this_post.a=a, this_post.b=b, this_post.c=b void setSides(int a, int b, int c); } 

2. abstract class Vertebrate extends Animal { // returns: an integer > 0 int neckBones(); } class Squid extends Vertebrate { // returns: 0 neck bones int neckBones(); } class Human extends Vertebrate { // returns: 7 neck bones int neckBones(); }