How can the error be solved?

In IBM API Connect, a user is unable to subscribe to a billing Plan with a Product.

How can the error be solved?
A . Ensure that the correct version of Node.js is installed
B . Enable or increase the permission level of cookies in the browser settings
C . Close the already started instance of the API Designer in another command window
D . Ensure that there are fewer than 25 instances in the IBM Cloud API Connect service

Answer: A