At an Intercalated Disc

At an intercalated disc,

A) the cell membranes of two cardiac muscle fibers are completely separated by a synapse.
B) the myofibrils are loosely attached to the membrane of the disc.
C) two cardiac muscle cells are connected by gap junctions.
D) t-tubules unite the membranes of the adjoining cells.
E) All of the answers are correct.