Which of the following pairs are correctly matched?

1. Mrichchakatikam–Shudraka
2. Buddhacharita–Vasuvandhu
3. Mudrarakshasha–Vishakadatta
4. Harshacharita–Banabhatta

Select the correct answer using the codes given below:
Codes:
(a) 1, 2, 3 and 4
(b) 1, 3 and 4
(c) 1 and 4
(d) 2 and 3