Final answer:
Shared writing is an interactive activity where a teacher and student work together to create written content, teaching students about writing practices in a collaborative environment.
Step-by-step explanation:
Shared writing is b) When the teacher and student work together to write a message. This collaborative activity involves both the teacher and the student in the writing process, where they can exchange ideas, and the teacher can model writing skills and strategies. Shared writing is part of an effective literacy program as it helps in socializing students to norms and practices in writing and reading. It's a means to authentically represent culture and engage students in a writing as conversation approach, emphasizing thinking, inclusive writing, critical writing, prewriting, drafting, peer review, and revision. The activity is interactive and encourages students to contribute to the writing process while learning from the teacher's guidance, hence fostering a rich, inclusive learning environment.