Which monomeric component of the biodegradable copolymer PHBV provides the necessary flexibility, making it suitable for manufacturing flexible capsules to enclose drugs?

Consider the following statements related to the glass transition temperature (Tg) of a polymer: A. Tg of the polymer increases with its molecular weight. B. Tg of the polymer increases upon addition of a plasticizer. C. Tg of the polymer is always lower than its melting temperature (Tm). The correct set of statements is:

Which of the following accelerators is used to introduce a network of crosslinks in an elastomer during vulcanization?