Exception in Logical Comparison with string data (Continuing): Logical comparisons of string data in R are performed based on alphabetical ordering, ignoring letter case at first. However, when two strings are identical apart from case, R uses case to break the tie—uppercase letters are considered greater than their lowercase counterparts (i.e., "A" > "a"). R compares the strings character by character from the beginning until it can determine which one is greater. For example: "uBc" and "ubc" are identical if case is ignored. R therefore compares them character by character: The first characters, "u" and "u", are both lowercase—no difference. The second characters, "B" and "b", differ in case. Since "B" is uppercase, it is considered greater than lowercase "b". Thus, R stops comparing further characters and concludes that "uBc" > "ubc". Which of the following comparisons result in TRUE?多项选择题