Explain IT band syndrome and how it affects all types of runners.
A) It is inflammation of the iliotibial band and can cause pain on the outer side of the knee; it affects all types of runners due to overuse.
B) It is a condition affecting only professional runners, causing pain in the ankles.
C) It is a genetic disorder that affects runners with certain genetic predispositions.
D) It is a temporary discomfort experienced by runners during warm-up sessions.