In which form may the operating limits of a glider be found?

Operating limits of a glider are crucial for ensuring safe flight conditions and are typically presented in a variety of formats. The correct choice identifies that these limits can commonly be found on placards within the cockpit, which serve as quick-reference guides. Additionally, airspeed indications or markings on the instruments provide specific information on safe operational speeds. Pilot operating manuals also contain extensive information regarding the glider's performance, weight limitations, and other critical operating parameters.

This multifaceted approach to presenting operating limits combines visual markers and comprehensive documentation, making it easier for pilots to access necessary information quickly and understand the glider's capabilities and restrictions. Relying solely on one source, such as verbal briefings by instructors or just the pilot's operating handbook, would not be practical or comprehensive for achieving a full understanding of operating limits. Therefore, the correct understanding integrates placards, instrument markings, and operating manuals, as they all contribute to a complete operational picture for safe flight.