What is the key difference between a prenuptial agreement and a postnuptial agreement? A.) A prenuptial agreement can only protect assets acquired before marriage, while a postnuptial agreement can protect assets acquired after marriage. B.) A prenuptial agreement is signed before marriage, while a postnuptial agreement is signed after marriage. C.) A prenuptial agreement is only valid if both spouses own a business, while a postnuptial agreement applies to all marriages. D.) A prenuptial agreement includes child custody arrangements, while a postnuptial agreement does not