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					 For a two-port network the three parameters A, B and C are given by—
 A = x1, B = x2, C = 1 x2
 then D is equal to under the network to be reciprocal—
- 
                        - 1 x1
- 0
- 2 x1
- 2 x1
 
Correct Option: C
The condition of reciprocity for ABCD parameters is given by relation 
AD – BC = 1 
| x1 D – X2. = | = 1 | |
| x2 | 
x1 D = 2
| D = | |
| x1 | 
 
	