Convert the quadratic: y = x² − 6x + 5 into vertex form by completing the square, and identify the vertex.

y = (x + 3)² - 4; Vertex: (-3, -4)

y = (x - 3)² + 5; Vertex: (3, 5)

y = (x - 3)² - 4; Vertex: (3, -4)

y = (x + 6)² - 31; Vertex: (-6, -31)