Which of the following statements are correct about the earthquake hazard mitigation measures that can be taken?

a. Earthquake monitoring centres can be established for regular monitoring and fast dissemination of information among the people in vulnerable areas. b. GPS can be of great help in monitoring the movement of tectonic plates. c. A vulnerability map of the country can be prepared for sharing risk information among the people and educating them about the ways to minimise the adverse impacts of disasters. d. Earthquake-resistant designs and light materials should be used in major construction activities in vulnerable areas.