Which special ending is at issue when stopping on «لَنَسْفَعًا»?

Rules of Waqf — Correct Stopping, Resumption, Rawm, Ishmām and Qurʾānic Orthography

• Nūn khafīfah replaced by alif
• Heavy nūn changed to mīm
• Tāʾ marbūṭah changed to hāʾ
• A qalqalah letter