In control systems, the type of system depends on the number of:

Correct option is D

​$$\text{The Type of the system is the number of poles present at the origin.} \\\text{The Order of the system is the total number of poles.} \\[10pt]\text{Ex: Transfer function} \quad G(s) = \frac{K}{s^2 (1 + sT)} \\[10pt]\text{The number of poles present at the origin} = 2 \\\text{So the type of the system} = 2 \\[10pt]\text{And since the total number of poles} = 3 \\\text{So, the order of the system} = 3$$​​