Final answer:
Large diameter nerve fibers close to the surface will be stimulated first with electrical stimulation.
Step-by-step explanation:
The nerve fibers that will be stimulated first with electrical stimulation are large diameter nerve fibers close to the surface. These fibers are responsible for conducting signals quickly and are typically involved in motor responses. For example, the axons of motor neurons in the anterior horn of the spinal cord, which emerge in the ventral nerve root, contain large diameter nerve fibers that send action potentials to cause skeletal muscles to contract in their target regions.