(a) a security shall be deemed to be convertible into a security of another class if, whether or not on conditions, it is or may be convertible into or exchangeable for, or if it carries the right or obligation to acquire, a security of the other class, whether of the same or another issuer, and

(b) a security that is convertible into a security of another class shall be deemed to be convertible into a security or securities of each class into which the second-mentioned security may be converted, either directly or through securities of one or more other classes of securities that are themselves convertible.