XYZ Gym Company is an accrual method taxpayer. The company sells gym memberships under $12-$month and $24$month prepaid contracts. A $12-$month membership costs $$480($ $$\frac{480}{12}=$$$40$ per month$)$; a $24-$month membership costs per month$).$ Cash payment in full is required at the beginning of the membership period. On July $1,2018,$ the company sold a $24$ month membership for $$720.$ The company should report as gross income from this contract:

a$)$ $$180$ in $2020$

b$)$ $$720$ in $2019$

c$)$ $$720$ in $2018$

d$)$ $$540$ in $2019$