An e-commerce company utilizes ‎Azure Data Lake Storage (ADLS) Generation 1 for Data Analytics. Your new assignment is to plan and design the migration of ADLS Generation 1 to ADLS Generation 2. You are deciding on the migration pattern to be used. The following are key considerations in this decision. 
->workload cannot afford any downtime 
-> least migration effort 
Which of the following is the most suitable pattern?

Answer options:

A.Lift and Shift
B.Incremental copy
C.Dual Pipeline
D.Bidirectional Sync

Correct Answer: C 
No downtime consideration will remove the Lift and Shift and incremental copy option from the list of suitable migration patterns.
Dual Pipelines are the best for scenarios where the workload and application are mission critical and cannot afford downtime, and when ingest can be done to both storage accounts. 
Bidirectional sync is ideal for complex scenarios involving many pipelines and dependencies where a phased approach might make more sense. But the migration effort will be high. So, this will shortlist Dual Pipeline as the most suitable pattern.
Option A is correct: No downtime consideration will incremental copy from the list of suitable migration patterns.
Option B is incorrect: No downtime consideration will remove the Lift and Shift from the list of suitable migration patterns.
Option C is correct: Dual Pipeline can migrate sufficing both conditions.
Option D is incorrect: Bidirectional sync is ideal for complex scenarios involving many pipelines and dependencies where a phased approach might make more sense. But the migration effort will be high.
Reference: 
To know more about migration approaches, please refer to the doc below: 

https://docs.microsoft.com/en-us/azure/storage/blobs/data-lake-storage-migrate-gen1-to-gen2#gen1-vs-gen2-capabilities