Question: A tablet with gastrosoluble film cover is being designed. Which of the following excipients exerts the function of plasticizer in said cover ?: 
 Options:  <1> Hydroxypropylmethylcellulose. <2> Methylcellulose <3> Copolymer of methacrylic acid (Eudragit® E30D (A)) <4> Polyethylene glycol <5> Titanium oxide.
4