current affairs in hindi

India is looking to export indigenously developed hull-mounted sonars with navies of friendly countries. Which of the following statment/s is/are correct about SONAR technology?

A. It is helpful for exploring and mapping the ocean because sound waves travel farther in the water than do radar and light waves

B. Besides detecting long-range aerial and other targets, sonars have applications in underwater surveillance, communication and marine navigation

C. There are two types of SONAR's : Active and Passive 

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