Which of the following statements regarding river meanders is/are correct?

1. It is a U-shaped bend in a river.

2. An extremely tight meander is called a goose neck; it is likely to become a cutoff, or oxbow lake, after a flood.

3. Tectonic uplift can cause a river to continue downcutting along its meandering course, producing incised or entrenched meanders.

Select the correct answer using the code given below.