Which pioneering DJ and producer, born in Bristol in 1965, helped develop trip-hop with the albums Blue Lines and Mezzanine as part of the group Massive Attack?

• A Robert Del Naja ✓
• B Geoff Barrow
• C Tricky
• D Roni Size

Robert '3D' Del Naja co-founded Massive Attack, whose 1991 debut Blue Lines is widely credited as the first trip-hop album, blending hip-hop, dub, and soul.