Last question in c++ basic 11/11

Question

I dont understand why the answer is 4 and not 5.

Can anybody explain?

Answer 1

No, 3 is just read first

Answer 2

because a++ = 3 and b = a++
so ++b = 4

Answer 3

but a is initially 3, so doesnt b = a++ make b = 4?

Answer 4

because b equals 3 before 1 is added

Answer 5

x++ = x + 1
++x = 1 +x

Answer 6

so
a = 3
b = a++

b = 3 ?

so the ++ is not really necessary?

Answer 7

or it just has no meaning in this scenario?