This question has two parts. Answer Part A$,$ and then answer Part B$.$

Part A

This sentence is from the passage.

"With that insight they formulated their unique mortar recipe: pozzolana, lime$,$ and seawater."

$($Paragraph $10)$

What does the word formulated suggest about the mortar recipe?

$1.$ The recipe was discovered by accident.

$2.$ The recipe was developed with precision.

$3.$ The recipe was shared openly and broadly.

$4.$ The recipe was intended for a single purpose. $q,$

Part B

Which detail from paragraph $10$ best supports the correct answer from Part A$?q,$

"noticing that, over time, the ash consolidated