4. Who has examined the trial of "Kavach" functioning between Gullaguda and Chitgidda railway stations? A.Nirmala SitharamanB.Ashwini VaishnavC.Hardeep Singh PuriD.Rajnath Singh
Explanation: The Union Minister of Railways, Communications, Electronics and Information Technology, Shri Ashwini Vaishnav has examined the trial of the "Kavach" methodology between Gullaguda and Chitgidda railway stations.
