India is considering exporting indigenously developed hull-mounted sonar along with navies of friendly countries. Which of the following statements are correct about sonar technology? A. It is useful for ocean exploration and mapping because sound waves travel farther in water than radar and light waves. B. In addition to detecting long-range aerial and other targets, sonar also has applications for underwater surveillance, communication and maritime navigation. C. There are two types of sonar: active and passive

• A. only A
• B. C only
• C. Au0026C only
• D. A, B u0026 C all three