Which sentences are technically correct
1 The Watchtower keeps changing its doctrines.
2. The Watch Tower keeps changing its doctrines.
3. The Watchtower Society keeps changing its doctrines.
4. Watchtower keeps changing its doctrines.
5. Watch Tower keeps changing its doctrines.
6. The Society keeps changing its doctrines.
7. The Watchtower organization keeps changing its doctrines.
8. The Watch Tower organization keeps changing its doctrines.