Which function and domain could represent the given graph?

f(x) = 1 – ⌊x⌋; –3 < x < 3
f(x) = 1 + ⌊x⌋; –3 ≤ x ≤ 3
f(x) = –⌊x⌋; –3 ≤ x ≤ 3
f(x) = ⌊x⌋; –3 < x < 3