Which of the following statements accurately describe the CRISPR-Cas9 technology and its applications? Select all that apply.

CRISPR‑Cas9 works by using a short RNA “guide” that matches a target DNA sequence; the Cas9 protein then cuts the DNA at that spot, letting scientists delete, add, or replace the gene. This precision lets researchers fix disease‑causing mutations, create animal models, or engineer crops with better traits. Because the system is inexpensive and easy to program, it is now used in medicine, agriculture, and basic biology research. For example, scientists have edited the gene that causes sickle‑cell anemia in patient cells, showing how a single cut can correct a harmful mutation.