Which statement(s) are true about inscribed angles?
Statement 1: The vertex of an inscribed angle lies on the circle.
Statement 2: The sides of an inscribed angle are tangent lines to the circle.
Statement 3: The sides of an inscribed angle are chords of a circle.
Statement 4: The vertex of an inscribed angle lies outside a circle.
1. 4 only
2. 2 & 4 only
3. 1 & 3 only
4. 1 only