Symbolic meaning of laying the keel in this specific case

[JACEK1]

Hello.
Symbolic meaning of laying the keel in this specific case - how to express it?
a) the day of laying the keel signifies the formal beginning of construction; from the day onwards classification societies will be exercising control over constructing the ferry/the construction of the ferry;
b) the day of laying the keel is a milestone in the process of building ships, placing classification societies in charge of the construction of the ferry from then on (from the very day on);
c) the day of laying the keel is a milestone in the process of building ships, placing the construction of the ferry into care of classification societies from then on (from the very day on);
d) the day of laying the keel is a milestone in the process of building ships when classification societies are entrusted with (exercising control over) the construction of the ferry;
e) the day of laying the keel is a milestone in the process of building ships and from then on classification societies are entrusted with (exercising control over) the construction of the ferry
I would like to ask you which of the above versions (if any at all) is acceptable and understandable to you.
What do you think?
Thank you.

 

[J&K Tutoring]

I know almost nothing of building ships, so I don't know what a classification society is or what they do. I guess there may be more than one classification society, but that only one could be in charge of overseeing construction of any one ship. That said, I suggest you begin with e:

Laying the keel is a milestone in the process of building a ship and from then on a classification society is entrusted with overseeing construction.