The correct statement about the following transformation is
1
[1, 5]-carbon shift with inversion and [1, 5]-hydrogen shift with retention
2
both [1, 5]-carbon shift and [1, 5]-hydrogen shift with inversion
3
[1, 5]-carbon shift with retention and [1, 5]-hydrogen shift with inversion
4
both [1, 5]-carbon shift and [1, 5]-hydrogen shift with retention