Which of the following revolutionaries were associated with revolutionary activities outside India?
1. Lala Har Dayal
2. Shyamji Krishna Varma
3. Virendranath Chattopadhyaya
4. Surya Sen

Select the correct answer using the code below:
A. 1 and 2 only
B. 1, 2 and 3 only
C. 2, 3 and 4 only
D. 1, 2, 3 and 4