Which raw material is used in the preparation of soft glass? [NDA]

• A. \[{{K}_{2}}C{{O}_{3}},Si{{o}_{2}},CaC{{O}_{3}}\]
• B. \[{{K}_{2}}C{{O}_{3}},Si{{O}_{2}},PbC{{O}_{3}}\]
• C. \[N{{a}_{2}}C{{O}_{3}},Si{{O}_{2}},CaC{{O}_{3}}\]
• D. \[N{{a}_{2}}C{{O}_{3}},Si{{O}_{2}},PbO\]