Examine the Fig. 96 shown below wherein the numbers indicate the links:

Which of the statements given below are correct?
1). \(I_{34}\) is at \(\infty\), perpendicular to \(Q S\)
2). \(I_{45}\) is at \(\infty\), perpendicular to \(Q S\)
3). \(I_{71}\) is at \(T\)
4). \(I_{45}\) is at \(R\).
Select the correct answer from the code given below :

(a) 1 and 2

(b) 1 and 4

(c) 2 and 3

(d) 1,3 , and 4 .

St R 5 3 6 1 2 17 Fig.96