Which Union Ministry unveiled the 'Dugdh Sankalan Sathi Mobile App'?

The Dugdh Sankalan Sathi Mobile App was launched recently by the Union Minister of Heavy Industries Dr.Mahendra Nath Pandey in Mussorie, Uttarakhand. The app was developed by Rajasthan Electronics & Instruments Limited (REIL), a Mini Ratna Central Public Sector Enterprise under the Ministry of Heavy Industries. This mobile app aims to improve the quality of milk, foster transparency among stakeholders, and streamline operations at the grassroots village level, including milk cooperative societies. Hence, option 'D' is correct.