Final answer:
The plan of Salisbury Cathedral in England, 1120-1265 (Early English style), is characterized by its double transept, and does not feature a square east end from Cistercian architecture, making the correct answer option 1.
Step-by-step explanation:
The Salisbury Cathedral, with construction spanning from 1120 to 1265, is known for its Early English Gothic style. A distinctive feature is its double transept, which is uncommon among English cathedrals.
Unlike the segmented quality that is often observed in Romanesque structures such as Durham Cathedral, Salisbury Cathedral's plan demonstrates a more unified and linear arrangement of spaces. However, the cathedral does not exhibit a square east end that is derived from Cistercian architecture.
This particular feature is more associated with the austerity and simplicity of Cistercian monastic buildings rather than the grandeur of Gothic cathedrals such as Salisbury. Therefore, the characteristic that defines the plan of Salisbury Cathedral is its double transept, making the correct answer to the student's question option 1.