Assuming the following employees and officers' loan outstanding, which of the following non-trade receivables is a current asset as of December 31, 2018, December 31, 2019, and December 31, 2020? Answer with a ye, no, or none. Show supporting waiting time analysis.

1. Loans receivable, term 4 years (granted 2-14-20)
2. Loans receivable, term 3 years (granted 2-14-20)
3. Loans receivable, term 2 years (granted 2-14-20)
4. Loans receivable, term 1 years (granted 2-14-20)
5. Loans receivable, term 2 years (granted 2-14-19)
6. Loans receivable, term 3 years (granted 2-14-18)
7. Loans receivable, term 4 years (granted 2-14-17)