If 26210 and 25 = 27, which describes all the lines that must be parallel?
S
5 6
1/2
8
7
4 3
13/14
9/10
12/11
น
16 15
O Only lines r and s must be parallel.
O Only lines t and u must be parallel.
Lines and s and lines and must be parallel
Neither lines r and s nor lines t and u must be parallel.