The activity that accenture should execute first to provide the client with an optimal cloud solution/landscape is; Negotiate pricing with the client's preferred cloud provider.
Since the company accenture has signed an agreement to help a telecoms provider to migrate all their applications to cloud platform over a couple of years, the first thing they must do is to negotiate the cost of migration with the preferred cloud services provider of the client.
This is because the agreement has already been signed and the next thing is modalities for execution of the migration and they need to first know the negotiate a price so that they will make their profit since it is a business at the end of the day.
Read more about Cloud Solution at;https://brainly.com/question/26057319
#SPJ1