Please select the correct answer:

use alphabet ? = {a, b} For this and the next question, prose is given and you must select the unique regular expression that correctly defines what the prose says. This one is: Zero or more occurrences of ab, then an optional string of however-many a's, then at least one more occurrence of ab. Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a (ab U a)*(ab)+ (ab)*a+(ba)* a(ba)*a* (ab) + d + (ab)*a+(ab) e (ab)*a* (ab) +