Java's predefined classes are grouped into

Which protocol is represented by the packet capture below? UDP 0.0.0.0:68 -> 255.255.255.255:67

A. DHCP B. FTP C. SNMP D. DNS

Analyze the following code:

``` public class A extends B { } class B { public B(String s) { } }``` a. The program has a compile error because A does not have a default constructor. b. The program has a compile error because the default constructor of A invokes the default constructor of B, but B does not have a default constructor. c. The program would compile fine if you add the following constructor into A: A(String s) { } d. The program would compile fine if you add the following constructor into A: A(String s) { super(s); }