Indicate Whether Each of the Following Descriptions Better Applies to Cardiac

Short Answer

Indicate whether each of the following descriptions better applies to cardiac (C), skeletal (K), myoepithelial (M), or smooth (O) muscle cells. Your answer would be a four-letter string composed of letters C, K, M, and O only, e.g. MMKC.
( ) They are derived from the ectoderm layer, similar to epithelial cells.
( ) They form the lining of cavities such as the urinary bladder.
( ) They are responsible for most voluntary muscle movements.
( ) They form multinucleated and exceptionally long muscle fibers.