The correct answer to the question “Which RPA tool provides an open platform for automation” is option C; UiPath. UiPath is the leader in Gartner’s magic quadrant consecutively for years now. UiPath offers you an open platform for automation.
If you wish to learn these tools of RPA and wish to advance in your career, then I would suggest you check out the RPA certification course from Intellipaat. Also, would like you to watch our YouTube video on Robotic Process Automation Tutorial.