Select all relations that represent a function.
A.
{(–4, 3),(–2, 4),(0, 1),(–4, –1)}


B.
{(5, 7),(2, 7),(9, 7),(8, 0)}


C.
{(3, 11),(–4, 5),(3, –1),(0, 0)}


D.
{(8, 0),(1, 4),(9, 4),(7, 8)}


E.
{(–5, 4),(–4, 3),(–3, 2),(–2, 1)}


F.
{(0, 0),(–1, 3),(–1, –1),(0, 5)}