On June 1, 2018, Delaware Company purchased computers costing $16,000 by paying $1,000 cash on June 1, 2018 and agreeing to pay the remaining $15,000 in 12 months. On June 1, 2018, as a result of this event,

a)equity increased by $15,000.

b)both total assets and liabilities increased by $16,000.

c)total assets decreased by $1,000.

d)both total assets and liabilities increased by $15,000.