Free PMP Exam Sample Question

The following PMP® exam sample question is taken from the Free PMP Exam Simulator:

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According to the PMBOK Guide, which of the following is not a valid activity dependency?

A.) Mandatory Dependency
B.) Internal Dependency
C.) External Dependency
D.) Discretional Dependency

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Hint: This question references the Sequence Activities process.

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Until next time,
Cornelius Fichtner, PMP
President, OSP International LLC - http://www.project-management-prepcast.com

thinking 2 seconds, can say it's B...

It will be a shame if i'm wrong since i've just finished Time management :)

Option B

Option D. It should be Discretionary dependency not Discretional dependency

Any explanation??

Based on The PMBOK there is 4 Dependency Determination :
1- Mandatory dependencies
2- Discretionary dependencies.
3- External dependencies
4- Internal dependencies
and the option it same to the book may be the question is wrong .

In PMBOK® 4th edition there are (page 139) three types of dependencies are used. Where as in PMBOK® 5th edition page 157, 158 dependencies are listed as 4.