Which certification level is NOT recognized by LEED?

The certification levels recognized by the LEED (Leadership in Energy and Environmental Design) system are Silver, Gold, and Platinum. These levels represent various degrees of environmental sustainability and energy efficiency achieved in building projects.

Basic is also not an official certification level, but it may refer to the foundational elements of sustainability that a project must meet to qualify for a LEED rating. In the context of standard certification levels, Bronze is not recognized at all, making it the correct response. Hence, the absence of a Bronze level in the LEED certification hierarchy is the reason that option is identified as not being a recognized certification level within the framework of LEED.