List of few satellites manufactured by ISRO is given below along with the date of their launch. Which two of the following Satellites failed to reach the orbit? (A) GSAT-2 - 8th May, 2003 (B) GSAT-4 - 15th April, 2010 (C) GSAT-5P - 25th December, 2010 (D) GSAT-12 - 15th July, 2011

Let's check the launch outcomes of the listed ISRO satellites: (A) GSAT-2: Launched on May 8, 2003, by GSLV-D2. This was a successful experimental flight of GSLV, and GSAT-2 was successfully placed into orbit. (B) GSAT-4: Launched on April 15, 2010, by GSLV-D3. This mission failed because the cryogenic upper stage of the GSLV did not ignite, resulting in the satellite failing to reach orbit. (C) GSAT-5P: Launched on December 25, 2010, by GSLV-F06. This mission failed catastrophically shortly after launch when the GSLV rocket exploded due to a faulty component. The satellite was destroyed and did not reach orbit. (D) GSAT-12: Launched on July 15, 2011, by PSLV-C17. This was a successful launch by the reliable PSLV, and GSAT-12 was placed into orbit. Therefore, the two satellites that failed to reach orbit are GSAT-4 and GSAT-5P.