I think is B.
A doesnt make any sense.
C narrows the traffic type to HTTP and HTTPS. This is not the only type of traffic than an application can have.
D Doesn't make any sense.
D makes sense to me, DevNet Cisco course specifically calls out how important it is to test a small number of users on new code/services and then slowly move more and more to the new service. A load balancer would be perfect for that.
B = Load Balancing
D = AutoScalling + Load Balancing
Is "Bring up new compute units" load balancers role?
Maybe the "modern application deployments" means this.
It is a very tricky question.
It is B)
From DEVASC training:
Applications need to be available 24 hours every day. A successful web application should be able to handle ingress traffic even when the number of users drastically rises and be able to support any amount of traffic. For example, if your web page loads in a couple of seconds with 100,000 users a month, it should be able to load within the same time even with double or triple the amount of users.
Very tricky question, to me D seems the most correct as you don't put in production things that are not tested, still I understand those who prefer B as there are situations (like containers for instance) which you don't really have to test anything anymore... maybe the "modern application deployments" means just that... I don't know.
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