Which of the following headers changes the subscript operator defined below so that it returns a non-modifiable reference? B) const Item_Type& operator[](size_t index) const C) Item_Type& operator[](size_t index) const D) static Item_Type& operator[](size_t index) const](https://d2lvgg3v3hfg70.cloudfront.net/TB10563/11eec35c_d7df_ccc8_ae1f_477fa28f4307_TB10563_00.jpg)
A) const Item_Type& operator[](size_t index)
B) const Item_Type& operator[](size_t index) const
C) Item_Type& operator[](size_t index) const
D) static Item_Type& operator[](size_t index) const
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