Option 1: Land revenue was mainly collected by revenue officers. This option suggests that revenue officers were primarily responsible for collecting land revenue during Tipu`s rule. However, this contradicts the correct answer, which states that it was mainly collected by government officials appointed by Tipu.

Option 2: Land revenue was mainly collected by government officials appointed by Tipu. This option aligns with the correct answer. It implies that during Tipu`s reign, the collection of land revenue was primarily conducted by government officials who were chosen and appointed by Tipu himself.

Option 3: Land revenue was collected by intermediaries. This option implies that the collection of land revenue was delegated to intermediaries. However, it contradicts the correct answer, which states that revenue was mainly collected by government officials appointed by Tipu.

Option 4: Land revenue was not allowed to go into the hands of the Sultan. This option suggests that the collected land revenue was prohibited from being directly accessed or controlled by the Sultan. However, this contradicts the correct answer, which states that the revenue was mainly collected by government officials appointed by Tipu.

In conclusion, option 2 accurately reflects the manner in which land revenue was collected under Tipu.