Let **f , g** be two random functions and **h** be a hash function. You are asked the following :

- \( F_f (r,m) = f(r) \oplus m \)
- \( {F}_{f,g} (r,m) = f(r) \oplus f(m) \)
- \( {F}_{f,h} (r,m) = f(r) \oplus h(m) \)
- \( {F}_{f,g,h} (r,m) = f(r) \oplus g(h(m)) \)
- \( {F}_{f,g} (r,m) = f(r) \oplus g(r \oplus m) \)
- \( {F}_{f,g,h} (r,m) = f(r) \oplus g(r \oplus h(m)) \)

Secure PRF or secure MAC?

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