Two networks are connected in cascade as shown in the figure. With the usual notations the equivalent A, B, C and D constants are obtained. given that, C = 0.025 `|__``45^@,` the value of `Z_2` is

`10 |__ 30^@ Omega`
`40 |__ - 45^@ Omega`
`1 Omega`
`0 Omega`