You are attending a monthly status meeting with your stakeholders. During the discussion with an influential stakeholder,

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You are attending a monthly status meeting with your stakeholders. During the discussion with an influential stakeholder, he asks you about a particular deliverable, He would like to know why it is taking so long to deliver and who is responsible for it. To answer his query, you refer a document and call Tom, who was responsible for this deliverable. What document is this?
(a) Scope statement
(b) Stakeholder register
(c) RACI chart
(d) Issue log