Part of peer editing a classmate's essay is reviewing it for proper overall MLA document formatting.

Which follows proper MLA formatting?

a$)$ Text should be double$-$spaced, the header left$-$aligned, and the title centered.

b$)$ Text should be single$-$spaced, the header left$-$aligned, and the title centered.

c$)$ Text should be single$-$spaced, and the header and title left$-$aligned.

d$)$ Text should be double$-$spaced, and the header and title centered.