In the enforcement of an order for spousal support, the court shall resort to the property described below in the order indicated:
(a) The earnings, income, or accumulations of either spouse after the date of separation, as defined in Section 70, which would have been community property if the spouse had not been separated from the other spouse.
(b) The community property.
(c) The quasi-community property.
(d) The other separate property of the party required to make the support payments.