Refereeing the table below what is the total duration for the summary activity, Business Requirements Definition?

WBS

Activity

Predecessors

Resource Name

Duration

TRN$001\mathrm{.}3$

Business Requirements Definition

TRN$001\mathrm{.}3\mathrm{.}1$

Gather requirements

TRN$001\mathrm{.}2$ FS

Technical Experts, Software

Architects, Project Manager, PMO

$4$ Days

TRN$001\mathrm{.}3\mathrm{.}2$

Document business requirements

TRN$001\mathrm{.}3\mathrm{.}1$ FS

Technical Experts, Software Architects, Project Manager

$2$ Days

TRN$001\mathrm{.}3\mathrm{.}3$

Review requirements

TRN$001\mathrm{.}3\mathrm{.}2$ FS

Technical Experts, Software Architects, Project Manager

$1$ Day

TRN$001\mathrm{.}3\mathrm{.}4$

Obtain authorization

TRN$001\mathrm{.}3\mathrm{.}3$ FS

Project Manager, PMO

$1$ Day

a$.$

$6$ days

b$.$

$2$ days

c$.$

$8$ days

d$.$

$1$ day

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