There is a need for a passive notch filter at 10 krad/s.

The narrower the notch the better, but there should be minimal ringing of the signals passing through. The transforms of three filters were submitted for consideration.

Which would you recommend and why?

T1ðsÞ ¼ s2 þ 100s þ 108 s2 þ 104s þ 108 T2ðsÞ ¼ s2 þ 500s þ 108 s2 þ 2500s þ 108 T3ðsÞ ¼ s2 þ 108 s2 þ 5000s þ 108