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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _normalize_options(options):
 """Renames keys in the options dictionary to their internally-used names."""

    normalized_options = {}
    for key, value in iteritems(options):
        optname = str(key).lower()
        intname = INTERNAL_URI_OPTION_NAME_MAP.get(optname, key)
        normalized_options[intname] = options[key]
    return normalized_options