Electric circuits — practice question

The circuit diagram illustrates a d.c. power supply linked to two resistors $R_1$ and $R_2$ together with four diodes. Which statement is correct?

• AThere is a current in $R_1$ and a current in $R_2$.
• BThere is a current in $R_1$ but no current in $R_2$.
• CThere is no current in $R_1$ but a current in $R_2$.
• DThere is no current in $R_1$ and no current in $R_2$.