Which statement best defines a fusion splice and its typical loss range in standard single-mode fiber under well-controlled conditions?

• A. A permanent joint created by fusing two fibers; typical loss ~0.02–0.1 dB for well-controlled conditions.
• B. A mechanical joint that aligns fibers in a sleeve; loss is typically higher than fusion.
• C. A patch cord connection using adhesives; variable loss.
• D. A splice formed by twisting and clamping fibers in a protective tube; excessive loss.

Answer: (B)