The expression of current in R-L circuit is?

• A. i=(V/R)(1+exp u2061((R/L)t))
• B. i=-(V/R)(1-exp u2061((R/L)t))
• C. i=-(V/R)(1+exp u2061((R/L)t))
• D. i=(V/R)(1-exp u2061((R/L)t))