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Which of the following reagents can be used to prepare benzaldehyde from toluene?

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Which of the following reagents can be used to prepare benzaldehyde from toluene?
A. `CrO_(3)` in `(CH_(3)CO)_(2)O`
B. `K_(2)Cr_(2)O_(7) + "conc."H_(2)SO_(4)`
C. Hot alkaline `KMnO_(4)`
D. Conc. `HNO_(3)`
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`K_(2)Cr_(2)O_(7) + conc. H_(2)SO_(4)`. Hot alkaline `KMnO_(4)` and conc. `HNO_(3)` will all oxidise toluene to benzoic acid while `CrO_(3)` in `CH_(3)(CO_(2)O)` (mild reagent) will oxidise toluene to benzaldehyde.
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