Which of the following would actions by the RBA would be considered an example of contractionary monetary policy?

Which of the following would actions by the RBA would be considered an example of contractionary monetary policf? {a} The RBA increases its inflation target range from 2-3 percent to 4-6 percent. {b} The RBA decreases its target Cash rate by 2 percentage points over a 12 month period. {c} The RBA increases its target Cash rate by 2 percentage points over a 12 month period. [d] The RBA buys $100 million in bonds from the banking system as part of its daily OM03. {e} Both (c) and (d}