Identify the correct statements about the properties of an ideal fuel:
S1: It burns at a moderate rate.
S2: It leaves behind harmful residues.
S3: It is easy to transport and has a high calorific value.
S4: It is expensive and not readily available.
1
S1, S2, and S3
2
Only S1 and S3
3
S2, S3, and S4
4
Only S1, S2, and S4