def METHOD_NAME(backend):
    """
    Return True if backend object is statevector.
    Args:
        backend (Backend): backend instance
    Returns:
        bool: True is statevector
    """
    if has_aer():
        from qiskit.providers.aer.backends import AerSimulator, StatevectorSimulator
        if isinstance(backend, StatevectorSimulator):
            return True
        if isinstance(backend, AerSimulator) and "aer_simulator_statevector" in backend.name():
            return True
    if backend is None:
        return False
    backend_interface_version = _get_backend_interface_version(backend)
    if backend_interface_version <= 1:
        return backend.name().startswith("statevector")
    else:
        return backend.name.startswith("statevector")