A divorce decree executed before $2019,$ provides that Pat is required to make payments to Chris of $$2,000$ per month until the date their daughter Cathy turns $21$ years of age. At that time the decree provides that the payments reduce to $$1,500.$ Which of the following is correct under these circumstances?

A$-$ Pat cannot deduct child support or alimony after her daughter's $21$st birthday

B$-$ Pat's maximum monthly alimony deduction before her daughter turns $21$ is limited to $$1,500,$ and $$500$ is treated as specifically designated as child support

C$-$ All payments made by Pat to Chris are considered alimony

D$-$ None of the payments made by Pat to Chris are considered alimony