Bernard is self- employed and earned $3,500 in fees preparing tax returns. His business expenses relating to the returns were $1,000. Under what circumstances is Bernard required to file an income tax return in 2021?

		He must file a return even if he earns no other income.
		He must file a return only if he earns an additional $650 in fees.
		He must file a return only if his net income is $4,200
		He must file a return only if his net income is greater than $12,550