High-rolling investors have positioned themselves bullish on Petrobras Brasileiro (NYSE:PBR), and it’s important for retail traders to take note.\This activity came to our attention today through Benzinga’s tracking of publicly available options data. The identities of these investors are uncertain, but such a significant move in PBR often signals that someone has privileged information. Today, Benzinga’s options scanner spotted 33 options trades for Petrobras Brasileiro. This is not a typical pattern. The sentiment among these major traders is split, with 54% bullish and 45% bearish. Among al…