A package P1 contains three elements—block B1, block B2, and block B3—all with public visibility, and a package P4 with private visibility. Another package P2 contains a package called B1 and two...

A package P1 contains three elements—block B1, block B2, and block B3—all with public

visibility, and a package P4 with private visibility. Another package P2 contains a package called

B1 and two blocks called B2 and B4. If package P2 imports package P1 with public visibility,

list all the members of P2.