Which of the listed differences between uncertainty and error are correct?

Error is a measure of the estimated difference between the observed or calculated value of a quantity and its true value.

Error can be less from the true value (negative error).

Example: If true value is 0.6 and measured value is 0.3, error is -0.3.

Error can be more than true value (positive error).

Example: If true value is 0.6 and measure value is 0.9, error is +0.3.

Uncertainty in measurements = degree of error in a measurement.

From above examples uncertainty in measurements is 0.3.