Which of the following framing methods support arbitrary sized characters at the data link layer?

At the data link layer, framing methods that support arbitrary sized characters include byte-oriented protocols like PPP (Point-to-Point Protocol) and character-oriented protocols such as HDLC (High-Level Data Link Control). These methods allow for variable-length data frames, accommodating different sizes of characters or data packets. In contrast, fixed-size framing methods, such as Ethernet, are limited to specific frame sizes, making them less flexible for arbitrary-sized characters.