During 11th Antarctic expedition in November 1991/March 1992 __ was installed.v

During 11th Antarctic expedition in November 1991/March 1992 __ was installed.
(A) Second permanent Maitree
(B) SODAR (Sonic Detection and Ranging)
(C) First permanent station ‘Dakshin Gangotri’
(D) None of the above

Correct Option is: B

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