What is the value of variable a for the following instructions: A. double a=1.5; a+=a+1; System.out.println(a); Answer: B. a=6; a /=2; System.out.println(a); Answer: C. int a=12; System.out.println(a/5); Answer: What are the values of variables a and b for the following codes: A. int a=6; int b=a++; System.out.println(a); System.out.println(b); Answer: B. a=6; b=++a System.out.println(a); System.out.println(b)