Which of the following descriptions relates to roll-up estimating?

• a.)
• b.)
• c.)
• d.)

Includes only the true costs for completing a project, without providing any options for changes

Identifies money that should be added to a project budget to manage potential project overages

Calculates all costs for a project by specifying a value for the lowest level project activities

Refersto budgets from previous projects that are similar to create estimates for the current project