UMG8900新发货的插框框号要设置为4时，则拨码开关bit0-bit1-bit2-bit3-bit4-bit5-bit6-bit7的设置为（）

• A、on-on-off-on-off-off-off-off
• B、on-off-on-on-off-off-off-off
• C、off-off-off-off-on-on-off-on
• D、off-off-off-off-on-off-on-on