Do the following production functions have increasing, decreasing, or constant returns to scale? Which ones fail to

Question:

Do the following production functions have increasing, decreasing, or constant returns to scale? Which ones fail to satisfy the law of diminishing returns?
a. Q = 4K1/2L1/2
b. Q = aK2 = bL2
c. Q = min (aK, bL)
d. Q = 4K + 2L
e. Q = K0.5L0.6
f. Q = K10.3K20.3L0.3