Consider the following statements regarding Einstein rings:

1. An Einstein ring is created when a gravitational lens distorts light from a distant background object, such as a star forming a circular pattern around the lens.

2. Light does not travel in a straight path when moving near massive objects, as these objects bend spacetime.

3. Einstein rings help astronomers understand the presence of dark matter, which can only be inferred from its gravitational effects on surrounding matter.

Which of the statements given above is/are correct?