For all operations, the size of the display screen of a mobile phone that is convenient to carry cannot be larger than 3.5 inches, and the display size of all mobile phones that pay attention to reading effects must be larger than 3.5 inches. The display screen of S-brand mobile phones is 4 inches. Based on the above facts, Which of the following judgment must be correct (). ["S brand mobile phones don't pay attention to reading effect.", 'nd S mobile phones are neither easy to operate and carry, nor pay attention to reading effects.', 'nd S mobile phones are not easy to operate and carry.', 'nd S mobile phones are easy to operate and carry.']