If total liabilities decreased by $$4,000,$ then

Group of answer choices

a$.$ stockholders$$ equity must have decreased by $$4,000.$

b$.$ assets must have decreased by $$4,000,$ or stockholders$$ equity must have increased by $$4,000.$

c$.$ assets and stockholders$$ equity each increased by $$2,000.$

d$.$ assets must have increased by $$4,000.$