Consider the code set below. 8 abstract class Computer { 9 String processorType; 10 String operSys; 11 12 public abstract void setProcessorType(String processor); 13 } 14 15 class Server extends Computer { 16 417 public void setProcessor Type(String processor) { 18 this.processor Type = processor; 19 } 20 } 21 122 class PC extends Computer { 23 String processorType = "X86"; 24 String operSys = "Windows"; 25 26 public void setopersys (String os) { 27 this.opersys - os; 28 } 29 ) What is unique about the variables processor Type and opersys? The variables are constants The variables must be updated via a setter method There is nothing unique about the variables The variables can be retrieved only via a getter method The variables must be numeric although they are declared String