An engineer must gather requirements for an upcoming wireless design in a manufacturing facility. Which requirement causes concerns for the customer?

Manufacturing environments contain dense metal structures, moving equipment like forklifts, and industrial machinery that cause significant RF absorption, reflection, and unpredictable interference, making it nearly impossible to guarantee consistent AP overlap for seamless roaming. Lossless roaming requires zero packet loss during AP handoffs, a guarantee that demands near-perfect RF coverage consistency - a condition that cannot be reliably engineered in such a dynamic physical environment. This requirement should raise an immediate red flag during the design phase with the customer.

Email is a latency-tolerant, low-bandwidth application that can function acceptably even with intermittent connectivity, posing no significant wireless design concerns in a manufacturing environment.

High-throughput multimedia is demanding but can be addressed through proper AP density and channel planning without facing the unpredictable physical-layer challenges unique to manufacturing floor roaming.

Intermittent web traffic is a best-effort, low-priority requirement that places minimal demands on wireless infrastructure and introduces no significant design risk.