If we have had embryo of early 20th century couple. Develops it as test tube baby in the end of?

... 21st century. How would be the congnitive development of that child? or:... 21st century. How would be the congnitive development of that child?

... 21st century. How would be the congnitive development of that child?

or:... 21st century. How would be the congnitive development of that child?

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