If P and Q are in holes 2 and 4, respectively, which of the following could be true ? 

Each of six pegs - P, Q, R, S, T and U - is placed in a different one of seven holes numbered consecutively 1 through 7 from left to right. The holes are evenly spaced and arranged in a straight line. The placement of the pegs is subject only to given conditions: 

 1. The distance separating P from Q must be the same as the distance separating R from S; 

 2. T must be in a hole immediately adjacent to the hole that U is in; 

 3. The left most hole cannot be the hole that is left empty.