Which of the following PPP configuration options is used to increase the effective throughput on PPP connections by reducing the amount of data in the frame that must travel across the link?

Authentication (PAP/CHAP) verifies the identity of peers before establishing a session but does not alter frame size or increase throughput.

Error detection (via LCP magic numbers or CRC) identifies corrupted frames but does not compress or reduce frame payload size.

Compression is a PPP option that applies algorithms such as Stacker or MPPC to reduce the byte size of frame payloads before they traverse the link. Because fewer bytes travel across the wire for the same amount of data, effective throughput increases without changing the physical link speed. This directly addresses the question's requirement of reducing the amount of data in the frame.

Multilink PPP (MLP) bundles multiple physical links for greater aggregate bandwidth but does not reduce the data in any individual frame.