a) storage.key(n)
b) storage.length
c) storage.setItem(key,value)
d) storage.clear()
Answer: b
Explanation: storage.length returns number of value pairs that are currently present in the list, storage.key(n) returns name of nth key from the list, storagesetItem(key,value) sets the value which is identified by key to value, storage.clear() empties the list which is associated with values.
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