Which of the following statements about Atal Tunnel are correct?

A. It connects Manali to Lahaul and spiti
B. It is world's longest highway tunnel
C. It has been built by Border Roads Organisation
D. It is constructed through Siwalik Himalaya

Choose the correct answer from the options given below:

A, B, and C only

The World’s longest Highway tunnel — Atal Tunnel (9.02 Km) has been built by Border Road Organisation. This tunnel connects Manali to Lahaul-Spiti valley throughout the year. Earlier the valley was cut off for about 6 months each year owing to heavy snowfall. The Tunnel is built with ultra-modern specifications in the Pir Panjal range of Himalayas at an altitude of 3000 metres from the Mean Sea Level (MSL).