Cellulose is composed of:
glucose monomers forming unbranched chains with only beta 1,4 linkages
glucose monomers forming unbranched chains with only alpha 1,4 linkages
both branched and unbranched chains with both alpha 1,4 and alpha 1,6 linkages
glucose monomers with branched chain having both beta 1,6 and beta 1,4 linkages
glucose monomers forming unbranched chains with only beta 1,4 linkages