World Hydrography Day is observed every year on 21 June. What is the theme for World Hydrography Day 2021?

‘Hydrography - underpinning the Blue Economy’

'Hydrography – enabling autonomous technologies'

“Hydrographic information driving marine knowledge”

'One hundred years of international cooperation in hydrography'

“Bathymetry – the foundation for sustainable seas, oceans and waterways”

World Hydrography Day is observed every year on 21 June. What is the

1.	World Hydrography Day is observed every year on 21 June. What is the theme for World Hydrography Day 2021?
A.	'Hydrography – enabling autonomous technologies'
B.	“Hydrographic information driving marine knowledge”
C.	'One hundred years of international cooperation in hydrography'
D.	‘Hydrography - underpinning the Blue Economy’
E.	“Bathymetry – the foundation for sustainable seas, oceans and waterways”
Answer» D. ‘Hydrography - underpinning the Blue Economy’