Conference pipeline — arrange the stages into a meaningful order from initiating outreach to active participation: (a) Conference, (b) Registration, (c) Participate, (d) Invitation, (e) Representatives.

Introduction / Context:
Events typically follow a communicative and administrative flow: invitations are sent, the event is scheduled/announced, target representatives are identified or confirmed, people register, and finally they participate. While some organizations finalize representatives before invitations, the given options require choosing the most coherent path among them. We therefore adopt a reasonable narrative consistent with the answer choices provided.

Given Data / Assumptions:

• Stages: Invitation (d), Conference (a), Representatives (e), Registration (b), Participate (c).
• “Conference” denotes the scheduled event occasion; “participate” denotes active attendance/engagement.

Concept / Approach:
A workable storyline: Organizers send an Invitation to announce the conference. The Conference (event) is the focal object around which the remaining actions orbit (date/venue/info are known). Organizations then confirm Representatives to attend, who proceed to Registration. On the day, they Participate. This keeps invitation first, participation last, and places registration after representatives are identified, matching a common administrative rhythm.

Step-by-Step Solution:
1) Invitation (d) — outreach.2) Conference (a) — event reference point.3) Representatives (e) — confirm attendees.4) Registration (b) — formal sign-up.5) Participate (c) — attend the event.Hence: d, a, e, b, c.

Verification / Alternative check:
Registration after invitation but before participation is essential. Participation cannot precede the event itself, and invitation logically precedes all other attendee actions.

Why Other Options Are Wrong:

• a, b, d, e, c / a, d, e, b, c: Starting with the event (“conference”) before invitations contradicts normal outreach.
• d, e, a, c, b: Places participation before registration.

Common Pitfalls:
Assuming representatives must be determined before the invitation; in many real cases, mass invitation precedes individual confirmations.

Final Answer:
d, a, e, b, c