Sample Questions: Java SE 5 and 6, Certified Associate (1Z0-850)

Option A is correct because SQL is used in the database tier.
Option B is incorrect because HTTP is a communication protocol between the web browser and web container.
Option C is incorrect because JDBC is NOT used in the database tier. It is used by the web or EJB containers to interact with the database tier.
Option D is correct because RDBMS is used in the database tier.
Option E is incorrect because JavaBeans is NOT used in the database tier.
Option F is incorrect because Entity beans are NOT used in the database tier.