What is the Arabic term for the suite form that structured a typical Umm Kulthum concert — a sequence of composed and improvised instrumental and vocal pieces in a single maqam?

• A Nuba
• B Longa
• C Samai
• D Wasla ✓

The wasla is a musical suite form that reached its peak in early 20th-century Cairo, combining instrumental preludes (dulab, taqsim), measured compositions (samai), and vocal muwashshahat into a unified performance in one melodic mode.