In الطَّالِبُ الَّذِي هُوَ مُجْتَهِدٌ ابْنُ زَيْدٍ, which words are the ṣilah?

Relative Nouns and Their Completing Clauses

• هُوَ مُجْتَهِدٌ
• الطَّالِبُ
• ابْنُ زَيْدٍ