You are executing a project and your team members couldn't rectify an error. You try by all means and finally call your senior technical architect, she starts digging and says it will take some time for her to understand the problem. You have wasted significant amount of time digging to resolve the error. During your lunch you casually tell this to one of your other technical member who works in a different department and he says they had the same issue in one of their previous product and with lot of research and help they solved the issue. The project manager then sought the help of the technical member and solved the issue in matter of minutes. This problem could have best been avoided by :

a) If the project manager would have approached that technical member earlier.
b) If the project manager had access to lessons learnt of similar type of projects from his PMO office.
c) Documented the issue and circulated the issue to his technical architect ontime.
d) Should have raised his voice much earlier and wrote a mail to all the technical members in his organisation.