Which one of the following statements about the grammarian Katyayana is correct ?

Katyayana, the famous Sanskrit grammarian and author of the Varttikas (critical notes/supplements on Panini's Ashtadhyayi), belonged to a period between Panini (c. 5th–4th century BCE) and Patanjali (c. 2nd century BCE). Katyayana is generally dated to the 3rd century BCE. Patanjali, in his Mahabhashya, commented on both Panini's sutras and Katyayana's varttikas, confirming the chronological sequence Panini → Katyayana → Patanjali.