Which comparison of Rules 3 and 4 is correct?

Weak-Initial Roots: Elision, Substitution, Assimilation and Short Paradigms

• Both always delete a letter
• Both occur only in Form VIII
• Rule 3 replaces wāw with tāʾ
• Rule 3 changes wāw to yāʾ after kasrah; Rule 4 changes yāʾ to wāw after ḍammah