A manager sends out an announcement to her team that reads as follows:

"Marty, Andrea, and Bert; are the new software developers joining the organization."

Keeping in mind the importance of formatting, spelling, punctuation, and grammar, identify the error in the given statement and the method to fix the error without changing the intended meaning.

a$.)$

There is incorrect comma usage between the names of the new software developers, which can be rectified by deleting both commas.

b$.)$

The statement includes an unnecessary semicolon, which can be rectified by replacing the semicolon with a comma.

c$.)$

There is a verb tense error, which can be rectified by replacing "joining" with "will join."

d$.)$

The statement includes an unnecessary semicolon, which can be rectified by simply deleting the semicolon.