Task: Class Definition Understanding (ontology: Sciences/Biology)

Which of the following definitions best describes 'alpha-D-Glcp-(1->4)-alpha-D-Glcp-(1->4)-alpha-D-Glcp-(1->4)-beta-D-Glcp'?

A. An amino tetrasaccharide comprised of a linear sequence of N-acetyl-beta-D-galactosamine, alpha-D-galactose, beta-D-galactose and beta-D-glucose residues linked (1->3), (1->6) and (1->4).
B. A linear trisaccharide comprising two beta-D-galactosyl residues and (at the reducing end) a beta-D glucose linked in sequence (1->3) and (1->4).
C. A glucotriose consisting of two alpha-D-glucopyranosyl residues and a D-glucopyranosyl residue joined in sequence by (1->3) and (1->2) glycosidic linkages.
D. A glucotetraose consisting of three alpha-D-glucopyranosyl residues and a beta-D-glucopyranosyl residue joined in sequence by (1->4) glycosidic bonds.

Answer: A glucotetraose consisting of three alpha-D-glucopyranosyl residues and a beta-D-glucopyranosyl residue joined in sequence by (1->4) glycosidic bonds.