What type of workflow is the most suitable for the final part?

What is the answer?

You need to collect employees data and send it by email as an Excel file. What type of workflow is the most suitable for the final part, which adds the file attachment, formats the email, and sends it?
A. Sequence
B. Flowchart
C. State Machine
D. Directed Acyclic Graph (DAG)

Please pick 1 in a,b,c,d