(a) Whoever is guilty of soliciting a murder, whether or not such murder occurs, shall be sentenced to a period of imprisonment not exceeding 20 years, a fine not more than the amount set forth in § 22-3571.01, or both. (b) Whoever is guilty of soliciting a crime of violence as defined by § 23-1331(4), whether or not such crime occurs, shall be sentenced to a period of imprisonment not exceeding 10 years, a fine of not more than the amount set forth in § 22-3571.01, or both.