During postmortem aging and the resolution phase ofrigor,
a. serine alkaline mast cells release calcium-activated calpainenzymes to degrade collagen.
b. tenderness is increased because actin and myosin myofibrillarproteins are enzymatically degraded.
c. myofibrils become weakened as Z-disks, desmin, titin, andnebulin are broken down by enzymes.
d. none of the above.