The correct answer is option 3, which states that the direction of the current in a current-carrying straight conductor can be determined using the Right-Hand Thumb rule, and it will be in the upward direction.

The Right-Hand Thumb rule is a method used to determine the direction of the magnetic field around a current-carrying conductor. According to this rule, if you point your right thumb in the direction of current flow, then the curl of your fingers represents the direction of the magnetic field lines around the conductor.

In this scenario, since the magnetic field lines are in the anti-clockwise direction, we can use the Right-Hand Thumb rule to determine the direction of the current. By pointing our right thumb in the direction of the magnetic field lines (anti-clockwise), our curled fingers will indicate the upward direction of the current.

Therefore, option 3 is correct, and the direction of the current in this scenario is in the upward direction, determined by using the Right-Hand Thumb rule.