Rearrange the parts of the sentence in correct order.

A 2007-2009 study

P. explored forward thinking techniques

Q. to synchronise time on board deep

R. space probes for accurate navigation, in

S. particular, looking into low-cost options

PQRS

The correct answer is Option (4) - PQRS

The corresct answer is PQRS.

A 2007-2009 study explored forward thinking techniques to synchronise time on board deep space probes for accurate navigation, in particular, looking into low-cost options.