Consider the systems with the following open loop transfer functions:
1. \(\frac{36}{s(s+3.6)}\)
2. \(\frac{100}{s(s+5)}\)
3. \(\frac{6.25}{s(s+4)}\)
The correct sequence of these systems in increasing order of the time taken for the unit step response to settle is:
(a) \(1,2,3\)
(b) 3, 1, 2
(c) 2, 3, 1
(d) 3, 2, 1