A buyer implicated in straw buying fraud typically...

In the context of straw buying fraud, the correct choice revolves around the buyer's secretive actions. Straw buying involves an individual purchasing real estate on behalf of another person, often to hide the true buyer's identity or financial situation from lenders. This deceitful practice typically involves concealing the straw buyer's intentions to ensure that lenders are unaware of the true nature of the financing arrangement.

By hiding their intentions from the lenders, the straw buyer can mislead financial institutions into thinking that they are the legitimate buyer, which can facilitate the approval of financing that might not be granted otherwise if the true buyer's financial situation were disclosed. This lack of transparency is a critical component of straw buying fraud.

Each of the other options involves activities that don't align with the fraudulent nature of straw buying. Purchasing properties for investment, securing legitimate income documents, or providing authentic mortgage applications would typically align with standard, legal real estate transactions rather than the deceptive practices inherent in straw buying.