 Hi friends I am Purva and today we will discuss the following question. If vector A is a non-zero vector of magnitude A and lambda is a non-zero scalar, then lambda vector A is a unit vector if A lambda is equal to 1, B lambda is equal to minus 1, C A is equal to mod lambda, D A is equal to 1 upon mod lambda. Let us begin with the solution now. Now we can clearly see that the correct answer is D because if we take A is equal to 1 upon mod lambda then we get lambda vector A is equal to mod lambda into 1 upon mod lambda. Since we have A is equal to 1 upon mod lambda and we get this is equal to 1. So we have got lambda vector A is equal to 1 by taking A is equal to 1 upon mod lambda. So we have proved lambda vector A is a unit vector. Hence the correct option is D. Hope you have understood the solution. Bye and take care.