3: Limit at −∞:
Horizontal asymptote y = 3 at −∞.
Limit at x = 0 from the left:
No vertical asymptote at x = 0 yet.
Limit at x = 0 from the right:
Vertical asymptote at x = 0.
Limit at ∞:
Horizontal asymptote y = 3 at ∞.
Answer