Which statement correctly describes item 58 about reading from a Mushaf?

Invalidators of Prayer, Part 3: Items 44–68 — Technical Cases

• The matn gives Imam Abu Hanifah's invalidating position, while the two companions are reported to differ.
• All Hanafi authorities agree it never affects prayer.
• All Hanafi authorities agree it always invalidates even if reading from memory.
• The issue concerns only looking at a closed book.