Given the function f (x comma y )equalsStartFraction 1 Over StartRoot 36 minus 25 x squared minus 25 y squared EndRoot EndFraction ​, answer the following questions. a. Find the​ function's domain. b. Find the​ function's range. c. Describe the​ function's level curves. d. Find the boundary of the​ function's domain. e. Determine if the domain is an open​ region, a closed​ region, both, or neither. f. Decide if the domain is bounded or unbounded.