Which institutions can propose an alternative to proposals contained in a citizens' initiative?

Political Constitution of Costa Rica (ConstituciónPolítica de la República de Costa Rica)

http://aceproject.org/ero-en/regions/americas/CR/costa-rica-constitucion-politica-de-la-republica

Law 8492 Referendum regulations (Decreto 8492 para laRegulaci?n del refer?ndum)

http://aceproject.org/ero-en/regions/americas/CR/costa-rica-decreto-8492-para-la-regulacion-del

Law 8491 Citizens’ Initiative (Ley 8491 de IniciativaPopular)