HOTSPOT
You have an Exchange Server 2013 organization that contains two servers named EX1 and EX2. Both
servers are in the same Active Directory site.
You run Get-TransportConfig | fi “shadow” and you receive the following output.
Use the drop-down menus to select the answer choice that completes each statement.
Answer: 
Explanation:
Target 1: ShadowHeartFrequency is 2 minutes and MaxRetriesForLocalSiteShadow is 2.
Shadow redundancy
https://technet.microsoft.com/en-us/library/dd351027(v=exchg.150).aspx
ShadowHeartbeatFrequency: The maximum amount of time a shadow server waits before opening an SMTP connection to the primary server to check the discard status of messages.
ShadowResubmitTimeSpan: How long a server waits before deciding that a primary server has failed and assumes ownership of shadow messages in the shadow queue for the primary server that’s unreachable.
What makes this question easier is the fact that 15 minutes and 3 days aren’t possible answers.
The only 2 time spans remaining are 2 minutes and 2 hours,
yes, waiting for answer about discard status for 3 days wouldnt be very nice, not mentioning decision to failover primary server queue every 15min – really smooth message system run..
ShadowHeartbeatFrequency is 2 min and maxretriesforlocalsite is 2
So target 1 4min
target 2 2hour