The statement that is not true about the Ijarah system is option 3, which states that under this system, land revenue was fixed for the peasant. In reality, the Ijarah system was not directly related to land revenue.

Now, let`s look at the other options to understand why they are not the correct answer:

Option 1 states that the Ijarah system was a system of revenue farming. Revenue farming is a system where the government leases out the right to collect revenue from a particular region to an individual or a group. So, option 1 is not the correct answer as it accurately describes an aspect of the Ijarah system.

Option 2 suggests that the Ijarah system encouraged the role of middlemen. This is true because the system involved the leasing of land to intermediaries, known as ijaradars, who would then cultivate the land or collect revenue from it on behalf of the state. Therefore, option 2 is also not the correct answer.

Option 4 states that the ijaradar paid a fixed amount to the state treasury. This is accurate because the ijaradar was required to pay a fixed amount of rent or revenue to the state treasury as part of the lease agreement. Therefore, option 4 is