Group 1 - The A-share market experienced a rebound with leading weights driving the increase [1] - All types of options saw increased trading activity and rising open interest, indicating a more active market [2] - The trading volume and open interest for various ETF options were significant, with the highest being the CSI 500 ETF options at 1,807,038 contracts traded and an open interest of 1,268,751 contracts [2] Group 2 - All option underlying assets closed in the green, and implied volatility increased, reflecting improved market sentiment [3] - The weighted implied volatility for major ETF options showed a range from 0.1432 for the CSI 300 index options to 0.2749 for the Huaxia Sci-Tech 50 ETF options [3] - The outlook for the stock market remains strong, with expectations of continued high implied volatility and strategies focusing on volatility [3]