What would the genotype and phenotype be for a same-site revertant strain of Clostridioides difficile when the S-layer mutant is slpA2.5, SlpA-?
a. slpA, SlpA+
b. SlpA+
c. slpA2.5 and an additional mutation, SlpA-
d. slpA2.5 and an additional mutation, SlpA+
e. slpA, SlpA-