What's An Uptrend?

Reading through all the educational material I've bought over the years, an Uptrend can be defined as:

• When the close (or low) is above an upward-sloping trend line you've drawn on the chart; or


• When there are successive higher highs and higher lows; or


• When the close (or low) is above a simple moving average (SMA); or


• When the SMA is rising; or


• When a faster SMA is above a slower SMA; or


• Combinations of the above.

Which of these are true? Probably all of the them. Backtest.