Which statements are true concerning the effect of the >> and >>> operators?（）  

• A、For non-negative values of the left operand， the >> and >>> operators will have the same effect.
• B、The result of （-1 >> 1） is 0.
• C、The result of （-1 >>> 1） is -1.
• D、The value returned by >>> will never be negative as long as the value of the right operand is equal     to or greater than 1.
• E、When using the >> operator， the leftmost bit of the bit representation of the resulting value will    always be the same bit value as the leftmost bit of the bit representation of the left operand.