An upcoming options expiry worth $4.2 billion U.S. could lead to near-term volatility in the price of %Bitcoin (CRYPTO: $BTC ), say analysts. Current Bitcoin options contracts are set to expire on Oct. 25. An option allows the holder the right, but not the obligation, to buy or sell an underlying asset at a specified price within a certain timeframe. The upcoming options expiry could cause some market volatility in coming days as holders of profitable options look to close their bets and sell some or all of their Bitcoin holdings. Bitcoin’s “max pain” level is currently $64,000 U.S. That’s the…