What Is the Safest and Most Effective Way of Stretching

What is the safest and most effective way of stretching the multijoint flexor digitorum profundus?

A) Stabilize the wrist, metacarpophalangeal, and proximal interphalangeal (PIP) joints in full extension; then passively extend the distal interphalangeal (DIP) joint.
B) With the wrist in neutral, stabilize the metacarpophalangeal and DIP joints in full extension; then passively extend the PIP joint.
C) First flex the wrist; then fully extend the DIP joint to the point of tissue resistance; then extend the PIP joint and then the metacarpophalangeal joint.
D) With the wrist stabilized in a neutral position, first extend the DIP joint, then the PIP joint, and then the metacarpophalangeal joint of each finger.